Who pays more for second- and third-tier drugs?
D017047:Cost Sharing / Q000191:economics*; D016568:Drugs, Generic / Q000627:therapeutic use*; D005252:Fees, Pharmaceutical; D006264:Health Benefit Plans, Employee / Q000191:economics*; D006801:Humans; D054524:Medicare Part D; D014481:United States
D016568:Drugs, Generic