CFR›Title 21›Chapter I›Part 340 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 340—STIMULANT DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE Subparts A Subpart A—General Provisions Sections 340.1–340.3 B Subpart B—Active Ingredient Section 340.10 C Subpart C—Labeling Section 340.50 Authority21 U.S.C. 321, 351, 352, 353, 355, 360, 371.Source53 FR 6105, Feb. 29, 1988, unless otherwise noted. Previous 338 Part 338—Nighttime Sleep-Aid Drug Products for Over-the-Counter Human Use Next 341 Part 341—Cold, Cough, Allergy, Bronchodilator, and Antiasthmatic Drug Products for Over-the-Counter Human Use