[Code of Federal Regulations] [Title 21, Volume 5] [Revised as of April 1, 2008] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR340.3] [Page 236] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF PART 340_STIMULANT DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE--Table of Contents Subpart A_General Provisions Sec. 340.3 Definition. As used in this part: Stimulant. A drug which helps restore mental alertness or wakefulness during fatigue or drowsiness.