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 scientific evidence. 21 UoS.Co 321(p) and 355;
 v. Bentex Pharmaceuticals, Incur 412 U_So 645 (1973). An
 acronym for this category is _human GRASE drugs 't (Generally
 Recognized As Safe and Effective). These drugs achieve
 acceptance through rigorous scientific proof, through a past
 history of widespread use in treatment in the United Statesf
 and through recognition by a consensus of drug experts
 outside the FDA.
 Third, Congress accepted for use in veterinary medicine
 those drugs "generally reccgnized_ among experts qualified
 by scientific training and experience to evaluate the safety
 and effectiveness of animal drugs, as safe and effective_ '_
 based on substantial scientific evidence. 21 UpS.Co 321(w)
 and 355. An acronym for these is _'_nimai GRASE drugs."
 They achieve acceptance through rigorous scientific evidence
 and through recognition by a consensus of drug experts
 outside the FDA. Unlike human GRASE drugs_ animal GRASE
 drugs need not have a past history of widespread use°
 Finally, Congress accepted those drugs marketed prior
 to 1938 which had been subject to tlhe 1906 provisions of the
 FDCA_ provided these very old drugs retain their exact
 formulations and are never promoted for new uses_ 21 U.S_C.
 321(p) and (w)_ These are politically '_grandfathered '_
 drugs_ They need not meet modern standards for safety and
 effectiveness.
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