Prescription Drug Affordability Act

Prescription Drug Affordability Act - Amends the Internal Revenue Code to allow a nonrefundable tax credit for 80 percent of the amount paid for a prescribed drug during the taxable year (and not compensated for by insurance or otherwise) by a taxpayer who has attained social security retirement age.

Amends the Federal Food, Drug, and Cosmetic Act (FFDCA) to repeal provisions restricting the importation of prescription drugs. Allows a person who meets applicable legal requirements to be an importer of prescription drugs upon application to the Secretary of Health and Human Services. Requires the Secretary to approve such an application if the drug meets all FFDCA requirements for admission into the United States, including that the drug has been approved by the Food and Drug Administration (FDA) and is not adulterated or misbranded.

Prohibits the Secretary from taking any action against any of the persons involved with the interstate sale of a prescription drug through an Internet site if: (1) the sale was made in compliance with applicable Federal and State laws; and (2) accurate information regarding compliance with such laws is posted on the Internet site.