Impact of a Prescription Copayment Increase on Lipid-Lowering Medication Adherence in Veterans

Background— In February 2002, the Department of Veterans Affairs (VA) increased copayments from 2 to per 30-day drug supply of each medication for many veterans. We examined the impact of the copayment increase on lipid-lowering medication adherence. Methods and Results— This quasiexperimental study used electronic records of 5604 veterans receiving care at the Philadelphia VA Medical Center from November 1999 to April 2004. The all...