Withdrawal Times for Medicines Used in Deer
In Canada, there are no drugs approved for use in cervids except the newly introduced wormer Eprinex. In the USA, only xylazine hydrochloride, yohimbine hydrochloride, carfentanil citrate and naltrexone are approved for cervids (Drew 1997). The usage of drugs in Canada is regulated under the Bureau of Veterinary Drugs. Drugs, for use in animals, are either prescription or over-the-counter drugs. Prescription drugs are those that can be obtained and used only on the written or verbal order of a veterinarian. Over-the-counter drugs are those that can be purchased and used without a prescription.
The use of all drugs not licensed for use in deer is considered extra-label. Only a veterinarian can authorize extra-label use of drugs. It is illegal for deer producers to use either prescription drugs for unlabelled uses or over-the-counter drugs for extra-label purposes unless those drugs are prescribed or dispensed by a licensed veterinarian in the presence of a valid veterinarian/ client/patient relationship. Use of a Medication Inventory Form will help producers and veterinarians to develop an organized approach to using medicines in a responsible manner.
Withdrawal times vary tremendously from jurisdiction to jurisdiction and between animal species. It is the veterinarian's responsibility to assign an appropriate withdrawal time for a drug when used in an extra-label manner. The following summary of withdrawal times is provided to help veterinarians when prescribing medications for use in deer.
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