Penicillin is the antimicrobial for which consultation is most frequently sought through FARAD and is one of the most commonly detected drug residues in tissue and milk. This article reviews studies related to extralabel penicillin administration and provides recommendations to assist veterinarians in preventing violative residues in tissue and milk.
Allergic reactions to foods containing residue concentrations of penicillin are rare and are almost always dermatologic reactions.