Site Feedback

Title 21

Displaying title 21, up to date as of 7/09/2026. Title 21 was last amended 7/09/2026.
There have been changes in the last two weeks to Part 524.
eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

Learn more about the eCFR, its status, and the editorial process.

Title 21Food and DrugsPart / Section
Chapter IFood and Drug Administration, Department of Health and Human Services1 – 1299
Subchapter EAnimal Drugs, Feeds, and Related Products500 – 599
Part 524Ophthalmic and Topical Dosage Form New Animal Drugs524.86 – 524.2620
§ 524.86Amitraz.
§ 524.154Bacitracin, neomycin, and polymyxin B ophthalmic ointment.
§ 524.155Bacitracin, neomycin, polymyxin B, and hydrocortisone ophthalmic ointment.
§ 524.230Buprenorphine.
§ 524.390Chloramphenicol ophthalmic ointment.
§ 524.402Chlorhexidine.
§ 524.450Clotrimazole.
§ 524.463Copper naphthenate.
§ 524.575Cyclosporine ophthalmic ointment.
§ 524.590Diclofenac.
§ 524.660Dimethyl sulfoxide.
§ 524.770Doramectin.
§ 524.775Emodepside and praziquantel.
§ 524.802Enrofloxacin and silver sulfadiazine otic emulsion.
§ 524.814Eprinomectin.
§ 524.815Eprinomectin and praziquantel.
§ 524.838Esafoxolaner, eprinomectin, and praziquantel.
§ 524.900Famphur.
§ 524.920Fenthion.
§ 524.955Florfenicol, terbinafine, and betamethasone acetate otic gel.
§ 524.957Florfenicol, terbinafine, and mometasone otic solution.
§ 524.960Flumethasone, neomycin, and polymyxin B ophthalmic solution.
§ 524.970Flunixin.
Fluocinolone Topical and Otic Dosage Forms524.981 – 524.2620
§ 524.981 [Reserved]
§ 524.981aFluocinolone cream.
§ 524.981bFluocinolone solution.
§ 524.981cFluocinolone and neomycin cream.
§ 524.981dFluocinolone and dimethyl sulfoxide solution.
§ 524.981eFluocinolone and dimethyl sulfoxide otic solution.
§ 524.998Fluralaner.
§ 524.1001Fluralaner and moxidectin.
§ 524.1005Furazolidone powder.
§ 524.1044Gentamicin ophthalmic and topical dosage forms.
§ 524.1044aGentamicin ophthalmic solution.
§ 524.1044bGentamicin and betamethasone otic solution.
§ 524.1044cGentamicin ophthalmic ointment.
§ 524.1044dGentamicin and betamethasone ointment.
§ 524.1044eGentamicin spray.
§ 524.1044fGentamicin and betamethasone spray.
§ 524.1044gGentamicin, betamethasone, and clotrimazole ointment.
§ 524.1044hGentamicin, mometasone, and clotrimazole otic suspension.
§ 524.1044iGentamicin and betamethasone ophthalmic solution.
§ 524.1132Hydrocortisone, miconazole, and gentamicin otic suspension.
§ 524.1140Imidacloprid and ivermectin.
§ 524.1144jGentamicin, posaconazole, and mometasone furoate otic suspension.
§ 524.1146Imidacloprid and moxidectin.
§ 524.1193Ivermectin topical solution.
§ 524.1195Ivermectin otic suspension.
§ 524.1200Kanamycin ophthalmic and topical dosage forms.
§ 524.1200aKanamycin ophthalmic ointment.
§ 524.1200bKanamycin ophthalmic solution.
§ 524.1204Kanamycin, amphomycin, and hydrocortisone ointment.
§ 524.1240Levamisole.
§ 524.1312Marbofloxacin, terbinafine, and dexamethasone otic suspension.
§ 524.13762-Mercaptobenzothiazole solution.
§ 524.1443Miconazole.
§ 524.1445Miconazole, polymixin B, and prednisolone suspension.
§ 524.1446Milbemycin otic solution.
§ 524.1448Mirtazapine transdermal ointment.
§ 524.1450Moxidectin.
§ 524.1465Mupirocin.
§ 524.1484Neomycin ophthalmic and topical dosage forms.
§ 524.1484bNeomycin, isoflupredone, and tetracaine powder.
§ 524.1484cNeomycin, isoflupredone, and tetracaine ointment.
§ 524.1484dNeomycin, hydrocortisone, and tetracaine otic ointment.
§ 524.1484eNeomycin and polymyxin B ophthalmic solution.
§ 524.1484fNeomycin, prednisolone, and tetracaine otic suspension.
§ 524.1484gNeomycin, thiabendazole, and dexamethasone solution.
§ 524.1484hNeomycin, penicillin, polymyxin B, and hydrocortisone suspension.
§ 524.1484iNeomycin and hydrocortisone ointment.
§ 524.1484kNeomycin and prednisolone suspension.
§ 524.1580Nitrofurazone topical dosage forms.
§ 524.1580aNitrofurazone ointment.
§ 524.1580bNitrofurazone soluble powder.
§ 524.1600Nystatin ophthalmic and topical dosage forms.
§ 524.1600aNystatin, neomycin, thiostrepton, and triamcinolone ointment.
§ 524.1600bNystatin, neomycin, thiostrepton, and triamcinolone ophthalmic ointment.
§ 524.1610Orbifloxacin, mometasone furoate monohydrate, and posaconazole suspension.
§ 524.1662Oxytetracycline ophthalmic and topical dosage forms.
§ 524.1662aOxytetracycline and hydrocortisone spray.
§ 524.1662bOxytetracycline and polymyxin B ophthalmic ointment.
§ 524.1742Phosmet emulsifiable liquid.
§ 524.1982Proparacaine ophthalmic solution.
§ 524.2080Ropinirole.
§ 524.2098Selamectin.
§ 524.2099Selamectin and sarolaner.
§ 524.2101Selenium disulfide suspension.
§ 524.2338Terbinafine and betamethasone acetate.
§ 524.2350Tolnaftate cream.
§ 524.2482Triamcinolone spray.
§ 524.2620Liquid crystalline trypsin, Peru balsam, castor oil.