[Code of Federal Regulations] [Title 21, Volume 5] [Revised as of April 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR336.10] [Page 232] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES--Continued PART 336--ANTIEMETIC DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE--Table of Contents Subpart B--Active Ingredients Sec. 336.10 Antiemetic active ingredients. The active ingredient of the product consists of any of the following when used within the dosage limits established for each ingredient in Sec. 336.50(d): (a) Cyclizine hydrochloride. (b) Dimenhydrinate. (c) Diphenhydramine hydrochloride. (d) Meclizine hydrochloride.