For the study, 52,898 patients prescribed to statin, antihypertensive, selective serotonin reuptake inhibitor (SSRI) or oral hypoglycemic medications were identified using California Medicaid claims from the Walgreens pharmacy chain in January 2010. Adherence is a measurement of how often patients take their medications as prescribed, and persistency is the length of time patients continue taking their medications. Medication wastage is defined as a switch of drug or drug strength within the same therapeutic class that occurred before the expected refill date.About Walgreens As the nation's largest drugstore chain with fiscal 2012 sales of $72 billion, Walgreens ( www.walgreens.com) vision is to become America’s first choice for health and daily living. Each day, Walgreens provides nearly 6 million customers the most convenient, multichannel access to consumer goods and services and trusted, cost-effective pharmacy, health and wellness services and advice in communities across America. Walgreens scope of pharmacy services includes retail, specialty, infusion, medical facility and mail service, along with respiratory services. These services improve health outcomes and lower costs for payers including employers, managed care organizations, health systems, pharmacy benefit managers and the public sector. The company operates 7,944 drugstores in all 50 states, the District of Columbia and Puerto Rico. Take Care Health Systems is a Walgreens subsidiary that is the largest and most comprehensive manager of worksite health and wellness centers and in-store convenient care clinics, with more than 700 locations throughout the country. ______________ 1 Kronick, R. G., Bella, M., & Gilmer, T. P. (2009). The faces of Medicaid III: Refining the portrait of people with multiple chronic conditions Center for Health Care Strategies, Inc.