FDA's Prohibited Drug List

Drugs Prohibited from Any Use in Food-Producing Animals 1

Antiviral compounds in poultry (including adamantane and neuraminidase inhibitors)
Chloramphenicol
Clenbuterol
Diethylstilbesterol (DES)
Dipyrone
Gentian violet
Glycopeptides (example vancomycin)
Nitroimidazoles (including metronidazole)
Nitrofurans (including topical use)
Phenylbutazone in adult dairy cattle 2

Drugs Prohibited from Extra-label Drug Use (ELDU) in Food-Producing Animals

Cephalosporin-class Antibiotics (restriction applies to cattle, chickens, pigs and turkeys only) 3
Fluoroquinolone-class Antibiotics
Medicated Feeds
Indexed Drugs (exceptions may be made for minor species)
Sulfonamide-class Antibiotics (restriction applies to adult dairy cattle) 4

Further Information:
1 In addition to the following AMDUCA list, regulations related to the Pasteurized Milk Ordinance (PMO) prohibit the presence of dimethyl sulfoxide (DMSO) or colloidal silver on dairy farms.
2 Lactating (adult) dairy cattle, as defined by the FDA, include all dairy cattle that are 20 months of age or older, regardless of whether they are milking or dry.
3 The effective date for prohibition of cephalosporin ELDU will be April 5, 2012 (click here for more information).
4 Currently, the only sulfonamide available for use in dairy cattle older than 20 months of age is sulfadimethoxine (SDM), which must be used according to label instructions. Use of higher doses or sustained-release SDM products is prohibited in adult dairy cattle.