Olcott, McKesson & Co. and John McKesson in 1833, the business began as an importer and wholesaler of botanical drugs. A third partner, Daniel Robbins, who joined the enterprise as it grew, and who previously "was an assistant to the original partners", was the "Robbins" when the company was renamed McKesson & Robbins following Olcott's death in 1853.

20th century

In 1938, the company was involved in the McKesson and Robbins scandal

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