Gessler s Drug Company is a pharmacy with several locations that serve the area of Wichita, Kan. The company is a subsidiary of Valu-Rite. Value-Rite is a chain of pharmacies and a subsidiary of McKesson Corporation. Founded in 1833, McKesson Corporation is a health care services and information technology company that provides pharmaceutical and medical-surgical supply management. The company provides services to hospitals, physicians, payors, retail pharmacies and manufacturers. The company s businesses include McKesson Automation, McKesson Specialty, McKesson Health Solutions, McKesson Provider Technologies, McKesson Medication Management, McKesson Medical-Surgical, McKesson Pharmaceutical and Zee Medical. Its pharmaceutical business is comprised of Health Mart, McKesson Health Systems, McKesson Packaging and Valu-Rite.