Medicare Part D beneficiaries in the coverage gap who pay 100% of prescription costs are twice as likely to stop taking their medications as they are to switch to more affordable drugs, researchers at Harvard University, Brigham and Women's Hospital and CVS Caremark found. "Instead of incentivizing beneficiaries to switch to lower-priced or generic drugs, entry into the coverage gap resulted in an abrupt discontinuation of or reduced adherence to drugs among elderly Medicare beneficiaries," the study authors wrote.

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