International Cooperation on Harmonisation of Technical Requirements for Registration of Veterinary Medicinal Products (VICH GL23(R)); Studies To Evaluate the Safety of Residues of Veterinary Drugs in Human Food: Genotoxicity Testing; Revised Guidance for Industry; Availability

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The Food and Drug Administration (FDA or Agency) is announcing the availability of a revised guidance for industry (GFI) #116 entitled "Studies to Evaluate the Safety of Residues of Veterinary Drugs in Human Food: Genotoxicity Testing" (VICH GL23(R)). This revised guidance has been developed for veterinary use by the International Cooperation on Harmonisation of Technical Requirements for Registration of Veterinary Medicinal Products (VICH). In this VICH guidance, the recommendation for a second test to evaluate the potential of a chemical to produce chromosomal effects is revised. The revised guidance indicates that the potential of a chemical to produce chromosomal effects can be evaluated using one of the following three tests: (1) An in vitro chromosomal aberrations test using metaphase analysis, which detects both clastogenicity and aneugenicity; (2) an in vitro mammalian cell micronucleus test, which detects the activity of clastogenicity and aneugenicity; or (3) a mouse lymphoma test, which, with modification, can detect both gene mutation and chromosomal damage. This revised VICH guidance document is intended to facilitate the mutual acceptance of safety data necessary for