A critical analysis of studies of state drug reimbursement policies: research in need of discipline.

Concerns over pharmaceutical costs and appropriateness of medication use have led state Medicaid programs to restrict drug reimbursement. This article critically reviews 20 years of research on cost sharing, drug reimbursement limits, and administrative limitations on access to particular drugs via formularies, category exclusions, or prior authorization requirements; evaluates their methodological rigor; summarizes the state of current …