CVS Caremark is a comprehensive guide to managing your prescription drug benefits. This guide provides information on how to use your prescription drug benefits, how to find the best prices for medications, and how to get the most out of your coverage
From Wikipedia
CVS Caremark Corporation is the pharmacy benefit management subsidiary of CVS Health Corporation, headquartered in Woonsocket, Rhode Island. As a pharmacy benefit manager (PBM), CVS Caremark handles prescription drug plans and is distinct from CVS Pharmacy, which is the retail subsidiary of CVS Health.