The formulary files. Increasing drug copayments deters compliance.
D017047:Cost Sharing; D011307:Drug Prescriptions / Q000191:economics*; D019538:Health Care Surveys; D006801:Humans; D007348:Insurance, Health; D010349:Patient Compliance / Q000706:statistics & numerical data*; D012646:Self Administration / Q000191:economics*; D014481:United States