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 1901, Teva Pharmaceuticals is the world's largest generic manufacturer with a total of 550 drugs. Its largest markets are in the UK, Germany, and the U.S but is in a top three leadership position in over 25 markets. Teva has 70 manufacturing sites including the U.S. and Israel.