What is Form 21B? Form 21B is a Wholesale Drug License issued under the Drugs and Cosmetics Act, 1940. It authorizes an individual or firm to engage in the wholesale distribution or sale of allopathic drugs, including prescription medicines. It is issued by the State Drug Licensing Authority (SLA) and is required in addition to Form 20B when dealing with prescription (Schedule H, ... https://www.psrcompliance.com/blog/what-is-form-21b-drug-license