This document is one of three publications prepared by the fifty-fourth session of the Joint FAO/WHO Expert Committee on Food Additives (JECFA), held in Geneva, in February 2000, and dedicated exclusively to the evaluation of veterinary drug residues in food. The report of the meeting will be published in the WHO Technical Report Series and the toxicological monographs as No. 45 in the WHO Food Additives Series. Residue monographs in this document provide information on chemical identity, properties, use, pharmacokinetics, metabolism, tissue residues and their depletion, and analytical methods for substances indicated. This publication is meant for regulatory authorities, veterinary drug researchers and any other concerned persons who wish to gain information on and insights into the assessment of the above-listed information involved in recommending maximum limits for veterinary drug residues in food.