21 CFR § 556.226
Enrofloxacin
June 25, 2020
(a) Acceptable daily intake (ADI). The ADI for total residue of enrofloxacin is 3 µg/kg of body weight per day.
(b) Tolerances. The tolerances for enrofloxacin are:
(1) Cattle. Liver (target tissue): 0.1 ppm desethylene ciprofloxacin (marker residue).
(2) Swine. Liver (target tissue): 0.5 ppm enrofloxacin (marker residue).
(c) Related conditions of use. See §522.812 of this chapter.