[Code of Federal Regulations] [Title 21, Volume 5] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR335.3] [Page 230] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 335_ANTIDIARRHEAL DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE--Table of Subpart A_General Provisions Sec. 335.3 Definitions. As used in this part: (a) Antidiarrheal. A drug that can be shown by objective measurement to treat or control (stop) the symptoms of diarrhea. (b) Diarrhea. A condition characterized by increased frequency of loose, watery stools (three or more daily) during a limited period (24 to 48 hours), usually with no identifiable cause. (c) Travelers' diarrhea. A subset of diarrhea occurring in travelers that is most commonly caused by an infectious agent. [68 FR 18881, April 17, 2003, as amended at 69 FR 26302, May 12, 2004]