The following information pertains to drugs that are available in Canada and have been approved by Health Canada:
Once the client is provided with a prescription, it is left to them to decide where they will have the prescription filled. The determination of the validity of a veterinary prescription is made by the dispenser. In some cases, some pharmacies will accept prescriptions from veterinarians not licensed in the jurisdiction in which the pharmacy is located, some will not. The integrity of the drug is the responsibility of the dispensing pharmacy, and they are required to follow the pharmacy regulations in their jurisdiction.
For oral or faxed prescriptions, a veterinarian can only deal directly with a pharmacist licensed in Ontario, another member of the College of Veterinarians of Ontario, or a licensed veterinarian practising outside of Ontario.
In addition, a veterinarian may wish to educate their client about the risks associated with purchasing drugs online, as outlined by Health Canada: Buying drugs over the internet - Canada.ca. The College regulates the practice of veterinary medicine in Ontario, including the issuance of prescriptions and the dispensing of drugs, but the regulation of pharmacies – in Ontario or elsewhere – is not within the jurisdiction of the College or its licensed veterinarians.