[Code of Federal Regulations] [Title 21, Volume 4] [Revised as of April 1, 2001] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR201.18] [Page 15] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES PART 201--LABELING--Table of Contents Subpart A--General Labeling Provisions Sec. 201.18 Drugs; significance of control numbers. The lot number on the label of a drug should be capable of yielding the complete manufacturing history of the package. An incorrect lot number may be regarded as causing the article to be misbranded.