Advertising and promotion (ad promo) of prescription drugs is regulated by the US Food and Drug Administration (FDA). In 1992, the agency implemented Subpart H of Title 21 of the Code of Federal Regulations (CFR) to allow for the accelerated approval of new drugs for serious or life-threatening illnesses. Approval of a drug through the Subpart H pathway introduced a range of regulatory requirements, some of which had specific implications for the ad promo of Subpart H drug...