Rexall, CVS, and Osco are all drugstore chains that have been around for many years. Rexall is a Canadian-based chain that was founded in 1904 and has over 500 stores across Canada. CVS is an American-based chain that was founded in 1963 and has over 9, 800 stores across the United States. Osco is an American-based chain that was founded in 1904 and has over 600 stores across the United States. All three of these drugstore chains offer a wide variety of products, including prescription medications, over-the-counter medications, health and beauty products, and more.