CFR›Title 21›Chapter I›Part 335 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 335—ANTIDIARRHEAL DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE Subparts A Subpart A—General Provisions Sections 335.1–335.3 B Subpart B—Active Ingredients Section 335.10 C Subpart C—Labeling Section 335.50 Authority21 U.S.C. 321, 351, 352, 353, 355, 360, 371.Source68 FR 18881, April 17, 2003, unless otherwise noted. Previous 333 Part 333—Topical Antimicrobial Drug Products for Over-the-Counter Human Use Next 336 Part 336—Antiemetic Drug Products for Over-the-Counter Human Use