(a)Covered pharmaceuticals. Except as specified in paragraph (b) of this section, this subpart applies to advertisements for a prescription drug or biological product distributed in the United States for which payment is available, directly or indirectly, under titles XVIII or XIX of the Social Security Act.(b)Excepted pharmaceuticals. An advertisement for any prescription drug or biological product that has a list price, as defined in § 403.1201 , less than $35 per month for a 30-day supply or typical course of treatment shall be exempt from the requirements of this subpart.