Do increased patient cost sharing and formulary restrictions reduce pharmaceutical use and costs? To answer this question, a RAND team ... examined more than 700,000 person-years of data on beneficiaries enrolled in health plans from 25 private employers.... The study's key findings: Increasing co-payments causes consumers to use less medication and less-expensive drugs. Higher co-payments do cut costs, but [m]ost of the savings go to health insurance plans, not to consumers.  MORE >>