Tizanidine is the generic form of the brand-name medication Zanaflex. It is a muscle relaxant used to treat muscle spasms and reduce pain by blocking pain signals from reaching the brain.

Founded in 1974, Apotex Inc. is Canada’s largest pharmaceutical maker and distributes about 300 drugs in the U.S. Apotex serves 100 countries through its range of product offerings. The number of manufacturing locations was not readily available, but at least some are located in the U.S., Mexico, and India.