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As the use of generic drugs has grown substantially to >85% of dispensed U.S. prescriptions, prices of some commonly prescribed generic drugs have also risen dramatically. In a retrospective cohort study of >1 billion prescription drug claims from >57 million patients within a database including 130 commercial health plans, investigators evaluated the effects of market competition on prices of 1120 generic drugs from 2008 to 2013. Using a structured scoring measure of market competition that incorporated number of generic drug manufacturers and market share for each manufacturer, they designated each drug as low-, medium-, or high-competition. Overall price (out-of-pocket cost + third-party payment) of dispensed generic prescriptions per qu…