Drugmakers including Purdue Pharma paid pharmacy benefit managers not to restrict painkiller prescriptions, a New York Times investigation found. Pain-Relieving Drugs, OxyContin (Drug), Drugs (Pharmaceuticals), Health Insurance and Managed Care, Rebates and Refunds, Opioids and Opiates, CVS Caremark Corporation, Express Scripts Inc, Mallinckrodt Pharmaceuticals, Purdue Pharma, Optum Inc Drugmakers including Purdue Pharma paid pharmacy benefit managers not to restrict painkiller prescriptions, a New York Times investigation found. NYT > Business