US lawFederal (United States)RegulationsTitle 21 CFR — Food and DrugsChapter I — FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICESPart 340 — STIMULANT DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USESubpart A — General Provisions340.321 C.F.R. § 340.3Definition.Last amended: 2016Year: 2026Length: 19 wordsOfficial source Cite as 21 C.F.R. § 340.3 (2026)As used in this part: Stimulant. A drug which helps restore mental alertness or wakefulness during fatigue or drowsiness.Previous21 C.F.R. § 340.1