There are a number of veterinary drugs that when used, exclude an equine from the human food chain. These range from the common (for example,  Phenylbutazone or ‘Bute’) to the more specific and rare.
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Once excluded from the food chain, an equine can never re-enter it. 

The latest list of controlled drugs can be found here.

What does ‘Excluded’ from the Food Chain mean?

Should I voluntarily exclude my equine from the food chain?

Who do I have to notify to rule my horse out of the food chain?

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This information is provided by Equine Register for the purposes of basic information sharing and guidance. However, any information provided cannot and must not be relied upon and independent opinion should be sought.