What Is Form 21B & Why Timely Approval Matters? Form 21B is the license required to wholesale Schedule C and C1 drugs like vaccines, injectables, and biologicals. This license is issued by the State Licensing Authority after inspection and verification. Delayed approvals can: Halt your business operations Prevent you from signing contracts with suppliers Risk expiration o... https://www.psrcompliance.com/blog/types-of-drug-license-in-india