McKesson Pharmacy Systems is a leading supplier of pharmacy management systems and services. It provides support and customer service for more than 2,300 pharmacy management systems in independent, chain, hospital, clinic and nursing home pharmacies across the United States. Its Pharmaserv pharmacy management system is designed to make pharmacies operate more efficiently and profitably with chain-wide control of pharmacy activities and point-of-sale, refill management and claims solutions. McKesson Pharmacy Systems is a business unit of McKesson Corporation, a public company headquartered in San Francisco. Founded in 1970 as 3PM, Inc., McKesson Pharmacy Systems is headquartered in Livonia, Mich.