S.28: A bill to amend title XVIII of the Social Security Act to require the use of generic drugs under the Medicare part D prescription drug program when available unless the brand name drug is determined to be medically necessary.

Generics First Act of 2007 - Amends part D (Voluntary Prescription Drug Benefit Program) of title XVIII (Medicare) of the Social Security Act to exclude from coverage under the Medicare part D prescription drug program all nongeneric (brand name) drugs unless no generic drug has been approved, and the brand name drug is determined to be medically necessary.