McKesson Corporation

McKesson distributes prescription drugs and medical supplies to pharmacies, hospitals, and clinics across the United States and internationally. The company supplies everything from common over-the-counter medications to specialty drugs and vaccines. McKesson also provides technology services to help pharmacies process prescriptions and manage insurance coverage, as well as consulting services to healthcare providers. The company was founded in 1833 and is one of the largest pharmaceutical distributors in the country.