Venlafaxine is the generic form of the brand-name medication Effexor. It is an antidepressant used to treat depression and certain anxiety disorders by increasing serotonin and norepinephrine levels in 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.