(a) The Department of Health may provide, by rule, for the exception from all provisions of this chapter, except as provided in section 4223 of this title, of the administration, dispensation, or sale at retail of a medicinal preparation containing such amounts of one or more regulated drugs that the Department considers not subject to abuse.
(b) The exemption authorized by this section shall be subject to the condition that the medicinal preparation administered, dispensed, or sold, shall contain, in addition to the regulated drug in it, some drug or drugs conferring upon it medicinal qualities other than those possessed by the regulated drug alone, and that such preparation shall be administered, dispensed, and sold in good faith as a medicine, and not for the purpose of evading the provisions of this chapter.