McKesson Corporation is an American company distributing pharmaceuticals and providing health information technology, medical supplies, and care management tools. The company delivers a third of all pharmaceuticals used in North America and employs over 78,000 employees. McKesson had revenues of $238.2 billion in its fiscal year ending March 31, 2021.McKesson is based in Irving, Texas, and distributes health care systems, medical supplies and pharmaceutical products. Additionally, McKesson provides extensive network infrastructure for the health care industry; also, it was an early adopter of technologies like bar-code scanning for distribution, pharmacy robotics, and RFID tags. The company has been named in a federal lawsuit of profiting from the opioid epidemic in the United States.Throughout the COVID-19 pandemic, McKesson was a key vaccine distributor, serving as the U.S. government's centralized distributor for hundreds of millions of COVID-19 vaccine doses and ancillary supply kits for over 1 billion doses across the United States.As of 2021, McKesson was ranked #7 on the Fortune 500 rankings of the largest United States corporations, with revenues of $238.2 billion.