A drug sold on a written prescription signed by a member of the medical, dental, or veterinary profession, except a drug sold in the course of the conduct of a business of selling drugs pursuant to diagnosis by mail, is exempt from the requirements of AS 17.20.090(2) and (5) if (1) the member of the medical, dental, or veterinary profession is licensed by law to administer the drug, and (2) the drug bears a label containing the name and place of business of the seller, the serial number and date of the prescription, and the name of the member of the medical, dental, or veterinary profession.