Legal compounding begins with FDA-approved drugs. Nevertheless, veterinarians recognize occasional instances where unapproved bulk drugs are needed to relieve pain and suffering in non-food animals when approved drugs are otherwise unavailable or medically insufficient. FDA discretionary policy must recognize that reality.
Read AVMA letters to FDA:
June 30, 2004 (PDF)December 13, 2012 (PDF)
2014 American Veterinary Medical Association