[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: 21CFR335.10] [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 B_Active Ingredients Sec. 335.10 Antidiarrheal active ingredients. The active ingredient of the product consists of any one of the following when used within the dosage limits established for each ingredient in Sec. 335.50(d): (a) Bismuth subsalicylate. (b) Kaolin.