[Code of Federal Regulations] [Title 21 Volume 5] [Revised as of April 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR341.18] [Page 229] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 341--COLD, COUGH, ALLERGY, BRONCHODILATOR, AND ANTIASTHMATIC DRUG PRODUCTS FOR OVER-THE-COUNTER HUMAN USE--Table of Contents Subpart B--Active Ingredients Sec. 341.18 Expectorant active ingredient. The active ingredient of the product is guaifenesin when used within the dosage limits established in Sec. 341.78(d). [54 FR 8509, Feb. 28, 1989]