21 CFR §610.17
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.