Federal Register Final rule: FDA is amending the animal drug regulations to reflect approval of an original NADA filed by Merial Ltd. that provides for the veterinary prescription use of eprinomectin by injection for treating and controlling internal and external parasites of cattle on pasture with persistent effectiveness. The current tolerance for the marker residue for total residues of eprinomectin in edible tissues of cattle is being lowered. The method of detection for residues of the carcinogenic excipient n-methyl-2-pyrrolidone (NMP) in edible tissues of cattle is also being codified. To view this final rule, click here.