Tadalafil is the generic form  of the brand-name medication Cialis. Tadalafil is most commonly  used to treat erectile dysfunction (ED), although it can also be used to treat an enlarged prostate.

Founded in 2002, Amneal Pharmaceuticals distributes more than 225 drugs in the U.S. In 2011, it was the seventh largest generics company in the country. Amneal has 14 manufacturing sites including in the U.S., India, and Ireland