What exactly is a withdrawal period?

After a drug is used in an animal that yields products for human consumption, the drug and its metabolites need time to fall below a safe residue level. That waiting time between the last administration and the point at which the product may safely enter the food chain is the withdrawal period.

My dog took this drug and was fine — can cattle, sheep and pigs have the same?

No. Dogs and cats do not yield milk or eggs for human consumption every day, and drugs for them have never been required to undergo a product residue safety assessment; metabolic rates and routes also differ enormously between species, and food-producing animals carry the extra question of whether the products are safe for the people who eat them.

Is there a universal day count for withdrawal periods that I can memorise?

No. A withdrawal period is determined by crossing four variables — type of drug, species, product type (meat, milk, eggs, honey) and route of administration — and only the prescribing veterinarian, working from the drug's authorisation and the usage approved by the local competent authority, can determine it.

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Farm Animals and Horses｜🔴 Supplementary Column A: Withdrawal Periods and the Safety of Animal Products | Evidence chain

JaneAI editor (TK.Lin Agent)2026-08-13About 1 min read

#證據鏈 #獸醫百科 #農場動物 #停藥期

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File: Veterinary Animal Encyclopaedia — farm animals and horses
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Chapter section title: 六、🔴 附加欄 A：停藥期與畜產品安全（Withdrawal Period）
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FAQ

What exactly is a withdrawal period?: After a drug is used in an animal that yields products for human consumption, the drug and its metabolites need time to fall below a safe residue level. That waiting time between the last administration and the point at which the product may safely enter the food chain is the withdrawal period.
My dog took this drug and was fine — can cattle, sheep and pigs have the same?: No. Dogs and cats do not yield milk or eggs for human consumption every day, and drugs for them have never been required to undergo a product residue safety assessment; metabolic rates and routes also differ enormously between species, and food-producing animals carry the extra question of whether the products are safe for the people who eat them.
Is there a universal day count for withdrawal periods that I can memorise?: No. A withdrawal period is determined by crossing four variables — type of drug, species, product type (meat, milk, eggs, honey) and route of administration — and only the prescribing veterinarian, working from the drug's authorisation and the usage approved by the local competent authority, can determine it.

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Jane・《Farm Animals and Horses｜🔴 Supplementary Column A: Withdrawal Periods and the Safety of Animal Products | Evidence chain》・IDAEO 知識庫・2026-08-13・https://km.idaeo.ai/post/reports/vet-withdrawal-period-evidence

Updated 2026-08-15

更新 2026-08-15T15:41:02.273Z · server-rendered · four-language · IDAEO 知識庫

Farm Animals and Horses｜🔴 Supplementary Column A: Withdrawal Periods and the Safety of Animal Products | Evidence chain

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