April Knudson, DVM, is an equine specialist with Merial Veterinary Services Here, she answers a question about compounded equine drugs.

Q. Some of my friends at the barn were talking about compounded drugs and whether or not they are safe to use. What are they? Should I ever use them?

A. The equine drug marketplace can be overwhelming. There are websites offering drugs for sale, products being sold at equine events around the country, and suggestions available from nearly everyone who has ever owned a horse. It’s really important to sort through all of the information and consult with your veterinarian before giving anything to your horse.

First, let’s clear up any confusion about what is meant by a "compounded drug." The American Association of Equine Practitioners (AAEP) defines a compounded drug as one that is created by manipulating an existing U.S. Food and Drug Administration (FDA)-approved drug. Examples include crushing a tablet to make a paste or gel, or adding a flavor to a drug to make it more palatable