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 2005, Zydus Pharmaceuticals distributes about 230 drugs in the U.S. In 2016, it was ranked the seventh largest generic drug corporation in the U.S. based on dispensed prescriptions. Zydus has 20+ manufacturing sites in India and the U.S.