The U.S. Food and Drug Administration (FDA) has published final guidance describing the conditions under which it does not intend to take enforcement action against those who compound animal drugs from bulk drug substances.
Guidance for Industry #256 (GFI #256), Compounding Animal Drugs from Bulk Drug Substances, establishes the parameters within which veterinarians may use compounded drugs that are prepared from bulk drug substances.
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[Source: AVMA 13 April 2022]