Home › CFR › Title 21 › Part 34021 CFR Part 340 — Stimulant Drug Products for Over-the-Counter Human UseSubpart A — General Provisions§ 340.1— Scope.§ 340.3— Definition.Subpart B — Active Ingredient§ 340.10— Stimulant active ingredient.Subpart C — Labeling§ 340.50— Labeling of stimulant drug products.