Section 65(5)(b) in The Drugs and Cosmetics Rules, 1945
(b)the name, address of the licensee to whom sold and his sale license number. In case of sale to an authority purchasing on behalf of Government, or to a hospital, medical, educational or research institution or to a Registered Medical Practitioner for the purpose of supply to his patients the name and address of the authority, institution or the Registered Medical Practitioner, as the case may be,