[Code of Federal Regulations] [Title 21, Volume 7] [Revised as of April 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 21CFR610.17] [Page 75] TITLE 21--FOOD AND DRUGS CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PART 610_GENERAL BIOLOGICAL PRODUCTS STANDARDS--Table of Contents Subpart B_General Provisions Sec. 610.17 Permissible combinations. Licensed products may not be combined with other licensed products either therapeutic, prophylactic or diagnostic, except as a license is obtained for the combined product. Licensed products may not be combined with nonlicensable therapeutic, prophylactic, or diagnostic substances except as a license is obtained for such combination.