{"id":19554,"date":"2026-08-12T14:28:37","date_gmt":"2026-08-12T07:28:37","guid":{"rendered":"https:\/\/www.vietstock.org\/?p=19554"},"modified":"2026-08-11T14:40:34","modified_gmt":"2026-08-11T07:40:34","slug":"veterinary-drug-withdrawal-periods","status":"publish","type":"post","link":"https:\/\/www.vietstock.org\/en\/industry-news\/veterinary-drug-withdrawal-periods\/","title":{"rendered":"Veterinary Drug Withdrawal Periods: How to Calculate the Earliest Sale or Slaughter Date"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">A veterinary drug withdrawal period is the minimum time that must pass after the final administration of a veterinary medicine before:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An animal may be slaughtered;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Milk may be collected for sale or processing;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Eggs may enter the food chain;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Other edible animal products may be harvested or marketed.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The purpose of the withdrawal period is to allow the animal\u2019s body enough time to metabolize and eliminate the medicine so that residues in meat, milk, eggs, or other edible tissues do not exceed the applicable maximum residue limit.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The withdrawal period is not the same as the treatment period.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A medicine may be administered for several days, but the withdrawal countdown generally begins only after the <\/span><b>final dose<\/b><span style=\"font-weight: 400;\">. If another dose is later administered, the withdrawal period must be recalculated from that new final dose.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For farms, the main operational risk is not simply forgetting the number of withdrawal days. Problems often arise because:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final dose is not recorded;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Different animal batches are mixed;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The wrong species information is read from the label;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A meat withdrawal period is applied to milk or eggs;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Several medicines are used but only one is checked;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An additional dose is given without updating the sale date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The sales or loading team does not receive the treatment information.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Withdrawal-period control should therefore be managed as a release process for each animal or production batch, not as a calculation kept only by the person administering the medicine.<\/span><\/p>\n<h2><b>Professional and Legal Note<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">This article provides general operational guidance. It does not replace:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The approved product label;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Package insert;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Veterinary prescription;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Instructions from the manufacturer;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Guidance from the veterinarian in charge;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Requirements of competent authorities;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Buyer, processor, certification, or export-market standards.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Do not use the illustrative numbers in this article as withdrawal periods for any real product.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The actual withdrawal period must be taken from the instructions for the specific veterinary medicine, animal species, dosage form, route of administration, dosage, and edible product involved.<\/span><\/p>\n<h1><b>1. The Core Rule: Count From the Final Dose<\/b><\/h1>\n<figure id=\"attachment_19540\" aria-describedby=\"caption-attachment-19540\" style=\"width: 1043px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19540\" src=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1096153436-612x612-1.jpg\" alt=\"Veterinary medicine being administered to cattle at a livestock farm\" width=\"1053\" height=\"702\" srcset=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1096153436-612x612-1.jpg 612w, https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1096153436-612x612-1-300x200.jpg 300w\" sizes=\"(max-width: 1053px) 100vw, 1053px\" \/><figcaption id=\"caption-attachment-19540\" class=\"wp-caption-text\">The withdrawal period begins after the final dose, not from the first day of veterinary treatment.<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">The most important rule is:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The withdrawal period is counted from the final administration of the medicine, not from the first treatment day.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example, a farm may administer a product for five consecutive days. If the medicine requires a withdrawal period after treatment, the countdown begins only after the fifth and final administration.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The treatment timeline therefore contains two separate periods:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Treatment period:<\/b><span style=\"font-weight: 400;\"> the period during which the medicine is administered;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Withdrawal period:<\/b><span style=\"font-weight: 400;\"> the waiting period after the final dose.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">The animal or product should not be released into the food chain until both periods have been completed.<\/span><\/p>\n<h1><b>2. Key Terms Farms Need to Distinguish<\/b><\/h1>\n<h2><b>2.1 Treatment period<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The treatment period is the number of days or administrations during which the medicine is used.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It may be stated on:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The product label;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Package insert;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Veterinary prescription;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Approved treatment instruction.<\/span><\/li>\n<\/ul>\n<h2><b>2.2 Final dose<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The final dose is the last actual administration given to the animal or batch.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It may be:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final injection;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final oral dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final medicated feed intake period;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final administration through drinking water;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final topical application;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Another final exposure covered by the product instructions.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The date and, where relevant, time of the final dose should be recorded immediately.<\/span><\/p>\n<h2><b>2.3 Withdrawal period<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The withdrawal period is the minimum waiting period after the final dose before the relevant animal product may enter the food chain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It may be expressed in:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hours;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Days;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Another specified time unit.<\/span><\/li>\n<\/ul>\n<h2><b>2.4 Maximum residue limit<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The maximum residue limit, commonly abbreviated as <\/span><b>MRL<\/b><span style=\"font-weight: 400;\">, is the permitted maximum concentration of a veterinary-drug residue in food under the applicable control framework.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Following the approved withdrawal period is one of the main farm-level measures used to reduce the risk of residues exceeding the applicable limit.<\/span><\/p>\n<h2><b>2.5 Earliest permitted release date<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">This is the earliest date or time on which the animal or product may be considered for sale, slaughter, collection, or processing after the full withdrawal period has been completed.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The release date should still be checked against:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All medicines used;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Buyer requirements;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product restrictions;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Treatment records;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Any additional veterinary guidance.<\/span><\/li>\n<\/ul>\n<h1><b>3. Withdrawal Periods Are Product-Specific<\/b><\/h1>\n<figure id=\"attachment_19546\" aria-describedby=\"caption-attachment-19546\" style=\"width: 1328px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19546\" src=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1886567119-640x640-1.jpg\" alt=\"Different livestock species including cattle, pigs and goats on farms\" width=\"1338\" height=\"753\" srcset=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1886567119-640x640-1.jpg 768w, https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1886567119-640x640-1-300x169.jpg 300w\" sizes=\"(max-width: 1338px) 100vw, 1338px\" \/><figcaption id=\"caption-attachment-19546\" class=\"wp-caption-text\">Veterinary drug withdrawal periods can vary by animal species, medicine, route of administration and edible product.<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">Farms should not assign one standard withdrawal period to all antibiotics or all veterinary medicines.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The withdrawal period may vary according to the following factors.<\/span><\/p>\n<h2><b>3.1 Animal species<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The same active ingredient may have different instructions for:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pigs;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Broilers;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Layers;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ducks;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cattle;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dairy cattle;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Goats;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sheep;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Other food-producing animals.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A withdrawal period stated for pigs should not be applied automatically to chickens or cattle.<\/span><\/p>\n<h2><b>3.2 Edible product<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A single product may contain separate instructions for:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Meat;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Milk;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Eggs;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Edible tissues;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Other animal products.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">For example, a product may have a meat withdrawal period but be prohibited for use in animals producing milk for human consumption.<\/span><\/p>\n<h2><b>3.3 Dosage form<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Withdrawal periods may differ between:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Injectable products;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Oral solutions;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Water-soluble powders;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Medicated feed;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Boluses;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Topical products;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Long-acting formulations.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Two products containing the same active ingredient may have different withdrawal periods because their formulations and absorption profiles differ.<\/span><\/p>\n<h2><b>3.4 Route of administration<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The route may affect the way a medicine is absorbed, distributed, and eliminated.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Examples include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Intramuscular injection;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Subcutaneous injection;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Intravenous administration;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Oral dosing;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Drinking-water administration;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Feed administration;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Topical application.<\/span><\/li>\n<\/ul>\n<h2><b>3.5 Dose and treatment duration<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The approved withdrawal instruction applies when the product is used according to its authorized conditions.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If the medicine has been:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Overdosed;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Used for longer than instructed;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Administered through another route;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Given to another species;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Used outside the label;<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">the farm should not calculate a new withdrawal period independently.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The case should be reviewed by a veterinarian, manufacturer, or another qualified source.<\/span><\/p>\n<h1><b>4. Not Every Label Statement Is a Withdrawal Period<\/b><\/h1>\n<figure id=\"attachment_19542\" aria-describedby=\"caption-attachment-19542\" style=\"width: 1085px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19542\" src=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-2158824742-612x612-1.jpg\" alt=\"Worker checking veterinary medicine labels and products stored on shelves\" width=\"1095\" height=\"730\" srcset=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-2158824742-612x612-1.jpg 612w, https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-2158824742-612x612-1-300x200.jpg 300w\" sizes=\"(max-width: 1095px) 100vw, 1095px\" \/><figcaption id=\"caption-attachment-19542\" class=\"wp-caption-text\">Withdrawal instructions should be checked on the label or package information of the exact veterinary medicine used.<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">Farm staff need to distinguish between a withdrawal instruction and a restriction on use.<\/span><\/p>\n<h2><b>Withdrawal instruction<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Examples of wording may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cWithdrawal period\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cWithdrawal time\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cMeat: \u2026 days\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cMilk: \u2026 hours\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cStop treatment \u2026 days before slaughter\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cEggs: \u2026 days\u201d.<\/span><\/li>\n<\/ul>\n<h2><b>Use restriction<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Examples include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cDo not use in laying hens producing eggs for human consumption\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cNot for use in lactating dairy cattle\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cDo not use in animals intended for breeding\u201d;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u201cNot approved for this species\u201d.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A statement such as \u201cnot for use in commercial laying hens\u201d does not mean the farm can use the product and then wait for an estimated period.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It means the product should not be used in that animal group within the stated scope.<\/span><\/p>\n<h1><b>5. A Six-Step Withdrawal-Period Control Process<\/b><\/h1>\n<figure id=\"attachment_19544\" aria-describedby=\"caption-attachment-19544\" style=\"width: 1157px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19544\" src=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-2161698318-612x612-1.jpg\" alt=\"Worker reviewing veterinary medicines and recording treatment information in storage\" width=\"1167\" height=\"778\" srcset=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-2161698318-612x612-1.jpg 612w, https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-2161698318-612x612-1-300x200.jpg 300w\" sizes=\"(max-width: 1167px) 100vw, 1167px\" \/><figcaption id=\"caption-attachment-19544\" class=\"wp-caption-text\">Accurate medicine records help farms track the final dose, withdrawal period and earliest permitted release date.<\/figcaption><\/figure>\n<h1><b>Step 1: Identify the exact medicine<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Record:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product trade name;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Active ingredient;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Concentration;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dosage form;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Manufacturer;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Registration number;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Batch number;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Expiry date.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Do not calculate withdrawal time using the active ingredient name alone.<\/span><\/p>\n<h1><b>Step 2: Identify the treated animals and edible product<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Record:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Animal species;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pen, house, flock, herd, or batch code;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Number of animals treated;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Production type;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Whether the relevant output is meat, milk, eggs, or another product.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This prevents the farm from reading the wrong withdrawal instruction.<\/span><\/p>\n<h1><b>Step 3: Record the final dose<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Record the exact:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Time, where relevant;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Route of administration;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Person administering the medicine.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If treatment continues beyond the original schedule, update the final-dose information.<\/span><\/p>\n<h1><b>Step 4: Read the correct withdrawal instruction<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Check the product information for the correct combination of:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Animal species;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product type;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Route;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dosage form;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Edible output.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Use the label, package insert, or prescription for the actual product.<\/span><\/p>\n<h1><b>Step 5: Calculate the earliest permitted release date<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Count the full withdrawal period beginning after the final administration, according to the product instruction.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Record the result in:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The veterinary logbook;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Farm-management software;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A batch-release board;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sales and loading records.<\/span><\/li>\n<\/ul>\n<h1><b>Step 6: Verify all treatments before release<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Before sale or slaughter, check whether the same animal or batch received any other medicine.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The final release date must satisfy the withdrawal requirements of <\/span><b>every product used<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h1><b>6. Basic Calculation Principles<\/b><\/h1>\n<h2><b>6.1 Record the date and time of the final dose<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The withdrawal calculation cannot be reliable without this information.<\/span><\/p>\n<h2><b>6.2 Use the time unit stated on the product<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Do not convert hours into days informally.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A label stating a withdrawal period in hours should be calculated in hours, especially when milk collection or another frequent production cycle is involved.<\/span><\/p>\n<h2><b>6.3 Complete the full withdrawal period<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The animal or product should only be released after the entire stated period has passed.<\/span><\/p>\n<h2><b>6.4 Recalculate after every additional dose<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">If an additional dose is administered, the previous release date is no longer valid.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A new calculation begins from the latest final dose.<\/span><\/p>\n<h2><b>6.5 Calculate each medicine separately<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">When several medicines are used:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Record the final dose of each medicine;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Calculate the withdrawal completion date for each product;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Compare the results;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Use the latest eligible release date.<\/span><\/li>\n<\/ol>\n<h1><b>7. Illustrative Calculation Examples<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">The following examples explain the calculation method only. They are not withdrawal instructions for any commercial product.<\/span><\/p>\n<h2><b>Example 1: Seven-day withdrawal after the final dose<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose: 10 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Illustrative withdrawal period: seven days.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The waiting period begins after the final dose.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The seven full withdrawal days are:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">11 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">12 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">13 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">14 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">15 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">16 July;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">17 July.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The earliest possible release date in this illustrative example is <\/span><b>18 July<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><b>Example 2: Treatment extended by one day<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The original treatment was expected to end on 10 July, but an additional dose was administered on 11 July.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The withdrawal period must be recalculated from the dose given on <\/span><b>11 July<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The previously calculated sale date must be cancelled.<\/span><\/p>\n<h2><b>Example 3: Two medicines used in the same batch<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Medicine A:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose: 5 August;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Illustrative completion date: 12 August.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Medicine B:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose: 7 August;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Illustrative completion date: 17 August.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The batch should not be considered eligible on 12 August merely because Medicine A has completed its withdrawal period.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The earliest potential release date is based on the later result: <\/span><b>17 August<\/b><span style=\"font-weight: 400;\">, subject to completing the full period and checking all other conditions.<\/span><\/p>\n<h2><b>Example 4: Withdrawal stated in hours<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final administration: 8:00 a.m. on 1 September;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Illustrative withdrawal period: 48 hours.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The earliest potential release time is after 8:00 a.m. on 3 September.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm should not simplify this automatically to \u201ctwo calendar days\u201d without considering the actual administration time.<\/span><\/p>\n<h2><b>Example 5: Different instructions for meat and milk<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A product may state one withdrawal period for meat and another for milk.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm needs separate release controls for:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Animal slaughter;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Milk collection.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Completion of the milk withdrawal period does not automatically mean that the meat withdrawal period has also been completed.<\/span><\/p>\n<h1><b>8. Special Situations Requiring Extra Caution<\/b><\/h1>\n<h2><b>8.1 The label does not state a withdrawal period<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Do not assume that the withdrawal period is zero.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm should contact:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The veterinarian;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Manufacturer;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Official distributor;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Competent veterinary authority.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The product should not be used in food-producing animals until its legal status and instructions are clear.<\/span><\/p>\n<h2><b>8.2 The label states zero days<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A zero-day withdrawal period only applies when the medicine is used:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In the correct species;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At the correct dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Through the correct route;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">For the correct duration;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">According to all label restrictions.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It does not apply automatically to off-label use.<\/span><\/p>\n<h2><b>8.3 The medicine is used outside the label<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Examples include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Another animal species;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Higher dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Longer treatment;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Different route;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Different production stage.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The approved withdrawal period may no longer be appropriate.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm should obtain veterinary guidance and should not create its own estimated extension.<\/span><\/p>\n<h2><b>8.4 Long-acting injections<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Long-acting products may remain in the body for longer than standard formulations.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm should use the withdrawal period for the exact long-acting commercial product, not another product containing the same active ingredient.<\/span><\/p>\n<h2><b>8.5 Topical medicines<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Topical application does not automatically mean no withdrawal period.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Some active ingredients may:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Be absorbed through the skin;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Remain on edible tissues;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contaminate milk or other products;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Carry specific pre-slaughter restrictions.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Check the label directly.<\/span><\/p>\n<h2><b>8.6 Sedatives used before transport<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Sedatives or stress-reduction medicines should not be administered before transport or slaughter without appropriate veterinary indication.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The label and withdrawal instructions should be reviewed before use.<\/span><\/p>\n<h2><b>8.7 Vaccines and biological products<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Many vaccines may not require a conventional withdrawal period, but the specific label may include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slaughter restrictions;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Waiting periods;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Production-stage limitations;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Special handling instructions.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The product label remains the controlling reference.<\/span><\/p>\n<h2><b>8.8 Prohibited substances<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A withdrawal period cannot legalize the use of a prohibited substance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If an active ingredient is prohibited within the applicable scope, waiting longer before sale does not make the use compliant.<\/span><\/p>\n<h1><b>9. Managing Multiple Animal Batches<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Withdrawal-period errors often occur when treated and untreated animals are managed together.<\/span><\/p>\n<h2><b>9.1 Assign a clear batch code<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The batch code may be based on:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">House number;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pen number;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flock placement date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Production group;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ear tag;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Electronic identification;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Another traceable system.<\/span><\/li>\n<\/ul>\n<h2><b>9.2 Mark the release status<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Each batch should have a visible status such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Under treatment;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Withdrawal period in progress;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pending veterinary review;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cleared for sale;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Not eligible for sale.<\/span><\/li>\n<\/ul>\n<h2><b>9.3 Prevent batch mixing<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Animals that are still within the withdrawal period should not be transferred into a batch already cleared for sale without maintaining individual traceability.<\/span><\/p>\n<h2><b>9.4 Inform every relevant department<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Withdrawal information should be shared with:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Farm manager;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Veterinary team;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sales team;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Loading team;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Transport coordinator;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slaughterhouse or buyer where required.<\/span><\/li>\n<\/ul>\n<h1><b>10. Controlling Milk Withdrawal Periods<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Milk may be collected multiple times per day, so time-based control is especially important.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm should record:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Animal identification;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product used;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final treatment time;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Milk withdrawal period;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Earliest permitted collection time;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Method for separating withheld milk.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Milk produced during the withdrawal period should be handled according to the applicable farm and regulatory procedure.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It should not be mixed into the saleable milk tank.<\/span><\/p>\n<h2><b>Practical controls<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mark treated animals visibly;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Update the milking list;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Separate milk lines or containers where appropriate;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inform every milking shift;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Record the first eligible collection;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Verify before returning milk to the saleable tank.<\/span><\/li>\n<\/ul>\n<h1><b>11. Controlling Egg Withdrawal Periods<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">For laying poultry, farms need to distinguish between:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A withdrawal period stated for eggs;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A product prohibited for use in commercial laying birds;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A product approved only before the laying stage.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Eggs collected during the withdrawal period should not enter the food chain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The farm should record:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flock or house code;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Treatment dates;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Withdrawal completion date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Egg collection status;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Handling of eggs produced during the restricted period.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Every collection and packing team should receive the updated status.<\/span><\/p>\n<h1><b>12. Pre-Sale and Pre-Slaughter Release Control<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Withdrawal-period management should end with a documented release decision.<\/span><\/p>\n<h2><b>Stage 1: Treatment-record review<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Check:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All medicines used;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose of each medicine;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Applicable species and product;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Withdrawal instruction;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Additional-dose history.<\/span><\/li>\n<\/ul>\n<h2><b>Stage 2: Date calculation<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Calculate the release date for each product.<\/span><\/p>\n<h2><b>Stage 3: Batch verification<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Confirm:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Correct animals;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Correct batch code;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">No untreated and treated batches were mixed;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">No recent unrecorded treatment occurred.<\/span><\/li>\n<\/ul>\n<h2><b>Stage 4: Sales check<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Compare the planned sale or slaughter date with the latest withdrawal-completion date.<\/span><\/p>\n<h2><b>Stage 5: Final approval<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A designated responsible person should approve the batch for release.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Without this approval, the loading team should not move the animals.<\/span><\/p>\n<h1><b>13. Practical Pre-Sale Checklist<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Before animals are sold or sent to slaughter, confirm that:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The animal or batch identification is correct;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All veterinary medicines used have been listed;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The final dose date and time are available;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Withdrawal instructions have been checked from the correct product;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Meat, milk, and egg instructions have not been confused;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">All withdrawal periods have been calculated;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The latest required release date has been identified;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">No additional dose was administered after the calculation;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">No animal remains under treatment;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The planned sale date occurs after completion of every withdrawal period;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prescriptions and medicine-use records are available;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Purchase documents and product labels are retained;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The responsible person has approved release.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If any item cannot be confirmed, the sale should be postponed until the information has been reviewed.<\/span><\/p>\n<h1><b>14. What to Do When the Withdrawal Period Is Not Complete<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">If a batch has been scheduled for sale too early:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stop the sale or loading process;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Inform the trader, processor, or slaughterhouse;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Update the eligible release date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep the animals under normal care;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Maintain batch identification;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Review why the error occurred;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Update the control procedure.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">The farm should not proceed simply because only one or two days remain.<\/span><\/p>\n<h1><b>15. What to Do After an Accidental Premature Sale<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">If animals or animal products are sold before the withdrawal period is completed, the farm should act immediately.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Possible actions include:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Informing the buyer or processor;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identifying the affected batch;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Preserving treatment records;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stopping further delivery;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Contacting the veterinarian;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Seeking guidance from the competent authority;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Supporting product isolation or testing where required;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Investigating the cause.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The farm should not alter or recreate records after the event.<\/span><\/p>\n<h1><b>16. Recordkeeping System<\/b><\/h1>\n<figure id=\"attachment_19548\" aria-describedby=\"caption-attachment-19548\" style=\"width: 958px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19548\" src=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-507302566-612x612-1.jpg\" alt=\"Veterinary medication record with medicines, syringe and stethoscope\" width=\"968\" height=\"699\" srcset=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-507302566-612x612-1.jpg 612w, https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-507302566-612x612-1-300x217.jpg 300w\" sizes=\"(max-width: 968px) 100vw, 968px\" \/><figcaption id=\"caption-attachment-19548\" class=\"wp-caption-text\">Treatment records should include the medicine used, final dose, withdrawal period and earliest date the animal or product can be released.<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">A withdrawal-period record should be completed at the time of treatment.<\/span><\/p>\n<h2><b>Minimum information<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Treatment start date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Treatment end date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose date and time;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product name;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Active ingredient;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product batch number;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Expiry date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dosage form;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Route;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Animal or batch identification;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Number of animals;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Withdrawal period;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Earliest permitted release date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Applicator;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prescriber or veterinarian;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Release approval.<\/span><\/li>\n<\/ul>\n<h2><b>Supporting records<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Keep:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product-label photograph;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Package insert;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prescription;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Purchase invoice;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Supplier information;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Laboratory or residue-testing results where applicable;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sale record;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slaughter or collection record.<\/span><\/li>\n<\/ul>\n<h1><b>17. Sample Withdrawal Tracking Table<\/b><\/h1>\n<table>\n<tbody>\n<tr>\n<td><b>Animal or batch code<\/b><\/td>\n<td><b>Product<\/b><\/td>\n<td><b>Final dose date\/time<\/b><\/td>\n<td><b>Product type<\/b><\/td>\n<td><b>Withdrawal period<\/b><\/td>\n<td><b>Earliest release date<\/b><\/td>\n<td><b>Sale status<\/b><\/td>\n<td><b>Approved by<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u2026<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2026<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2026<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Meat \/ milk \/ eggs<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2026<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2026<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Blocked \/ cleared<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u2026<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">When multiple products are used, each medicine should have a separate entry.<\/span><\/p>\n<h1><b>18. Digital Management Options<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Larger farms may use digital tools to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Record treatments;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Scan medicine batches;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Calculate release dates;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flag animals within the withdrawal period;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Prevent sales orders from being created;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Notify staff before the release date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Link records with animal identification;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Share information with buyers.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">However, automated calculations are only reliable when the farm enters:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The correct medicine;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Correct animal species;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Correct final dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Correct withdrawal instruction.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Software does not replace verification of the product label.<\/span><\/p>\n<h1><b>19. Common Withdrawal-Period Mistakes<\/b><\/h1>\n<h2><b>Counting from the first treatment day<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> The animal may be sold before the full withdrawal period has passed.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Count from the final dose.<\/span><\/p>\n<h2><b>Applying one species\u2019 withdrawal period to another<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> The instruction may not be valid for the treated animal.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Read the species-specific label section.<\/span><\/p>\n<h2><b>Confusing meat, milk, and egg instructions<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> One animal product may be released too early.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Manage each edible product separately.<\/span><\/p>\n<h2><b>Using the active ingredient instead of the product label<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> Different formulations may have different withdrawal periods.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Use the exact commercial product information.<\/span><\/p>\n<h2><b>Failing to update after an additional dose<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> The old release date remains in the system.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Recalculate from the latest administration.<\/span><\/p>\n<h2><b>Checking only the longest-looking number<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> The final dose dates of different products may differ.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Calculate each medicine independently.<\/span><\/p>\n<h2><b>Assuming an unclear label means zero days<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> Food products may contain uncontrolled residues.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Hold the batch and request clarification.<\/span><\/p>\n<h2><b>Failing to identify treated animals<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> Treated animals may be mixed with saleable animals.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Use individual or batch identification.<\/span><\/p>\n<h2><b>Allowing the sales team to work without treatment data<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> Sale schedules may be created before withdrawal completion.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Integrate veterinary and sales records.<\/span><\/p>\n<h2><b>Shortening the period because the animal has recovered<\/b><\/h2>\n<p><b>Risk:<\/b><span style=\"font-weight: 400;\"> Clinical recovery does not prove residues have fallen below the applicable limit.<\/span><\/p>\n<p><b>Correction:<\/b><span style=\"font-weight: 400;\"> Complete the full withdrawal period.<\/span><\/p>\n<h1><b>20. Residue Testing and Withdrawal Periods<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Following the withdrawal period is a basic preventive control, but testing may still be required by:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Competent authorities;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Slaughterhouses;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Processors;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Buyers;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Certification programs;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Export markets;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Risk-based monitoring programs.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Testing may be considered when:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Records are incomplete;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Medicine use is uncertain;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A dosage error occurred;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An unapproved route was used;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A prohibited substance is suspected;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A high-risk batch is being released;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A buyer requires verification.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A negative screening result should not be used to justify routine failure to follow withdrawal instructions.<\/span><\/p>\n<h1><b>21. Frequently Asked Questions<\/b><\/h1>\n<figure id=\"attachment_19550\" aria-describedby=\"caption-attachment-19550\" style=\"width: 1118px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19550\" src=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1224249413-612x612-1.jpg\" alt=\"FAQ letters with medicine tablets and a bottle illustrating veterinary drug questions\" width=\"1128\" height=\"612\" srcset=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1224249413-612x612-1.jpg 612w, https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/istockphoto-1224249413-612x612-1-300x163.jpg 300w\" sizes=\"(max-width: 1128px) 100vw, 1128px\" \/><figcaption id=\"caption-attachment-19550\" class=\"wp-caption-text\">Common questions about veterinary drug withdrawal periods include when to start counting, how to manage multiple medicines and when livestock can be sold or slaughtered.<\/figcaption><\/figure>\n<h2><b>Do all veterinary medicines have withdrawal periods?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">No.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Some products may state zero days, while others may be restricted from use in specific food-producing animals.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Never assume zero days when the label is unclear.<\/span><\/p>\n<h2><b>How many days should antibiotics be stopped before slaughter?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">There is no universal number.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The answer depends on the exact product, species, dosage form, route, dose, duration, and edible product.<\/span><\/p>\n<h2><b>Is the withdrawal period counted from the first or final dose?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">It is generally counted from the final dose.<\/span><\/p>\n<h2><b>What happens when another dose is given?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The withdrawal period must be recalculated from the newest final dose.<\/span><\/p>\n<h2><b>Which withdrawal period should be used when several medicines are administered?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Calculate every medicine separately and use the latest eligible release date.<\/span><\/p>\n<h2><b>Can a farm wait longer than the minimum period?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Yes, the farm may delay sale beyond the minimum period. However, a longer waiting period does not correct an illegal product, unclear label, overdose, or off-label use without professional review.<\/span><\/p>\n<h2><b>Can topical products have withdrawal periods?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Yes. Check the label of the specific product.<\/span><\/p>\n<h2><b>Does zero-day withdrawal mean the product can be used in any animal?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">No. Zero-day instructions only apply within the approved species, dose, route, purpose, and restrictions.<\/span><\/p>\n<h2><b>Can a prohibited substance become acceptable after a long waiting period?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">No. A withdrawal period cannot legalize prohibited use.<\/span><\/p>\n<h2><b>Is residue testing always required before sale?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Not in every transaction. Requirements depend on authorities, buyers, certification programs, market standards, and consignment risk.<\/span><\/p>\n<h2><b>How should small farms manage withdrawal periods?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A simple paper log can be effective when it records:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Product;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Treated animals;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Final dose;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Withdrawal period;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Earliest sale date;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Person approving release.<\/span><\/li>\n<\/ul>\n<h1><b>Improve Withdrawal-Period and Residue Control at VIETSTOCK 2026<\/b><\/h1>\n<p><span style=\"font-weight: 400;\">Withdrawal-period compliance depends on accurate treatment records, clear animal or batch identification, timely calculation of release dates, and coordination between veterinary, farm-management, sales, transport, slaughter, and processing teams.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">At <\/span><b>VIETSTOCK 2026<\/b><span style=\"font-weight: 400;\">, livestock producers, veterinarians, slaughterhouses, processors, laboratories, and technology providers can explore solutions that support medicine management and residue control throughout the production chain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Visitors can:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Explore<\/b><span style=\"font-weight: 400;\"> software for recording treatments, final doses, withdrawal periods, and release dates by animal or production batch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Discover<\/b><span style=\"font-weight: 400;\"> identification technologies for separating animals under treatment from batches cleared for sale.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Review<\/b><span style=\"font-weight: 400;\"> residue-screening equipment and laboratory services for feed, meat, eggs, and milk.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Connect<\/b><span style=\"font-weight: 400;\"> with veterinary businesses, processors, laboratories, and traceability-solution providers.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Learn<\/b><span style=\"font-weight: 400;\"> how digital records can support communication between farms, buyers, slaughterhouses, and certification programs.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Discuss<\/b><span style=\"font-weight: 400;\"> medicine-use and residue-control requirements in domestic and export-oriented supply chains.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Expected to feature more than <\/span><b>300 brands<\/b><span style=\"font-weight: 400;\">, over <\/span><b>10,000 sqm of exhibition space<\/b><span style=\"font-weight: 400;\">, and <\/span><b>13,000 trade visitors<\/b><span style=\"font-weight: 400;\"> from more than <\/span><b>40 countries and territories<\/b><span style=\"font-weight: 400;\">, VIETSTOCK 2026 creates opportunities for stakeholders to improve transparency in veterinary-medicine use and strengthen food-safety control across the livestock value chain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Alongside the exhibition and business-networking activities, <\/span><b>VIETSTOCK 2026<\/b><span style=\"font-weight: 400;\"> will also organize an <\/span><b>On-Farm Seminar Series<\/b><span style=\"font-weight: 400;\">, bringing practical knowledge on herd and flock management, disease prevention, biosecurity, and livestock-production efficiency to key livestock regions.<\/span><\/p>\n<p><b>Date:<\/b><span style=\"font-weight: 400;\"> 21\u201323 October 2026<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <b>Venue:<\/b><span style=\"font-weight: 400;\"> Saigon Exhibition and Convention Center \u2013 SECC, 799 Nguyen Van Linh Street, Tan My Ward, Ho Chi Minh City, Vietnam<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <b>Event website:<\/b><a href=\"https:\/\/www.vietstock.org\/en\/\"> <span style=\"font-weight: 400;\">https:\/\/www.vietstock.org\/en\/<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49 <\/span><b>Register to visit VIETSTOCK 2026 and explore medicine-management, residue-testing, animal-identification, and traceability solutions:<\/b><b><br \/>\n<\/b><a href=\"https:\/\/www.vietstock.org\/en\/online-registration-2\/\"> <span style=\"font-weight: 400;\">https:\/\/www.vietstock.org\/en\/online-registration-2\/<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">\ud83d\udc49 <\/span><b>Learn more about the VIETSTOCK 2026 On-Farm Seminar Series:<\/b><b><br \/>\n<\/b><a href=\"https:\/\/www.vietstock.org\/en\/event-features\/vietstock-2026-livestock-roadshows-bringing-industry-knowledge-to-key-livestock-regions\/\"> <span style=\"font-weight: 400;\">https:\/\/www.vietstock.org\/en\/event-features\/vietstock-2026-livestock-roadshows-bringing-industry-knowledge-to-key-livestock-regions\/<\/span><\/a><\/p>\n<p><b>CONTACT INFORMATION:<\/b><\/p>\n<p><b>Exhibiting:<\/b><span style=\"font-weight: 400;\"> Ms. Sophie Nguyen \u2013 Sophie.nguyen@informa.com<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <b>Visitor Support:<\/b><span style=\"font-weight: 400;\"> Ms. Phuong \u2013 Phuong.C@informa.com<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <b>Marcom Support:<\/b><span style=\"font-weight: 400;\"> Ms. Anita Pham \u2013 Anita.pham@informa.com<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Veterinary drug withdrawal periods are the minimum waiting time after the final dose before livestock can be sold or slaughtered, or products such as milk and eggs can enter the food chain. This guide explains how to calculate release dates and manage treatment records correctly.<\/p>\n","protected":false},"author":3,"featured_media":19555,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Veterinary Drug Withdrawal Periods: How to Calculate Them<\/title>\n<meta name=\"description\" content=\"Learn how veterinary drug withdrawal periods are calculated from the final dose and how to determine the earliest sale or slaughter date for livestock.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vietstock.org\/en\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Veterinary Drug Withdrawal Periods: How to Calculate Them\" \/>\n<meta property=\"og:description\" content=\"Learn how veterinary drug withdrawal periods are calculated from the final dose and how to determine the earliest sale or slaughter date for livestock.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/\" \/>\n<meta property=\"og:site_name\" content=\"Vietstock Expo and Forum\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-12T07:28:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-11T07:40:34+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/veterinary-drug-withdrawal-periods.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\">\n\t<meta name=\"twitter:data1\" content=\"19 minutes\">\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.vietstock.org\/#website\",\"url\":\"https:\/\/www.vietstock.org\/\",\"name\":\"Vietstock Expo and Forum\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/www.vietstock.org\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/#primaryimage\",\"inLanguage\":\"en\",\"url\":\"https:\/\/www.vietstock.org\/wp-content\/uploads\/2026\/08\/veterinary-drug-withdrawal-periods.jpg\",\"width\":1200,\"height\":675,\"caption\":\"Withdrawal periods must be completed after the final dose before livestock are sold or slaughtered or animal products enter the food chain.\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/#webpage\",\"url\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/\",\"name\":\"Veterinary Drug Withdrawal Periods: How to Calculate Them\",\"isPartOf\":{\"@id\":\"https:\/\/www.vietstock.org\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/#primaryimage\"},\"datePublished\":\"2026-08-12T07:28:37+00:00\",\"dateModified\":\"2026-08-11T07:40:34+00:00\",\"author\":{\"@id\":\"https:\/\/www.vietstock.org\/#\/schema\/person\/caaf897414eac1b9f130df4ddb9e34d6\"},\"description\":\"Learn how veterinary drug withdrawal periods are calculated from the final dose and how to determine the earliest sale or slaughter date for livestock.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/#breadcrumb\"},\"inLanguage\":\"en\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.vietstock.org\/en\/\",\"url\":\"https:\/\/www.vietstock.org\/en\/\",\"name\":\"Trang ch\\u1ee7\"}},{\"@type\":\"ListItem\",\"position\":2,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/\",\"url\":\"https:\/\/www.vietstock.org\/tin-nganh\/thoi-gian-ngung-thuoc-thu-y\/\",\"name\":\"Veterinary Drug Withdrawal Periods: How to Calculate the Earliest Sale or Slaughter Date\"}}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.vietstock.org\/#\/schema\/person\/caaf897414eac1b9f130df4ddb9e34d6\",\"name\":\"vietwatercc\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.vietstock.org\/#personlogo\",\"inLanguage\":\"en\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/1f8963694a555b77c6f4e61284c4fadb?s=96&d=mm&r=g\",\"caption\":\"vietwatercc\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/posts\/19554"}],"collection":[{"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/comments?post=19554"}],"version-history":[{"count":1,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/posts\/19554\/revisions"}],"predecessor-version":[{"id":19557,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/posts\/19554\/revisions\/19557"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/media\/19555"}],"wp:attachment":[{"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/media?parent=19554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/categories?post=19554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietstock.org\/en\/wp-json\/wp\/v2\/tags?post=19554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}