CFR›Title 21›Chapter I›Part 336 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 336—ANTIEMETIC DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE Subparts A Subpart A—General Provisions Sections 336.1–336.3 B Subpart B—Active Ingredients Section 336.10 C Subpart C—Labeling Sections 336.50–336.80 Authority21 U.S.C. 321, 351, 352, 353, 355, 360, 371.Source52 FR 15892, Apr. 30, 1987, unless otherwise noted. Previous 335 Part 335—Antidiarrheal Drug Products for Over-the-Counter Human Use Next 338 Part 338—Nighttime Sleep-Aid Drug Products for Over-the-Counter Human Use