To amend titles XVIII and XIX of the Social Security Act to provide for continuity of Medicare prescription drug coverage for full-benefit dual eligible individuals, for Medicare prescription drug coverage of benzodiazepines and off-label uses of certain prescription drugs and biological products, for optional Medicaid coverage of Medicare prescription drug cost-sharing for full-benefit dual eligible individuals, for authorization to the Secretary of Health and Human Services to waive certain determinations denying Medicare prescription drug coverage, and for holding pharmacies harmless for certain costs incurred during implementation of Medicare part D.