This section does not apply to: a physician licensed to practice medicine; a government unit; or the otherwise lawful conduct of business between commercial, medical, pharmaceutical, scientific, or government units. Except in accordance with a prescription written by a physician licensed to practice medicine, a person may not sell, dispense, or give to another a drug, medicine, preparation, substance, or a preparation containing a sulfonamide drug to alleviate, treat, or cure venereal disease. A prescription under subsection (b) of this section shall include: the physician’s signature and address; and the date the prescription was written. The person filling the prescription required under subsection (b) of this section: shall write on the prescription the date it was filled; shall keep the prescription on file for at least 2 years after it was filled; shall allow the prescription to be inspected by State and local health authorities; and may not refill the prescription except on the order of the physician who wrote the prescription. A person who violates this section is guilty of a misdemeanor and on conviction is subject to a fine not exceeding: $50 for the first violation; and $250 for each subsequent violation.