what's the generic medication for cialis?
<answer> Tadalafil (INN) is a PDE5 inhibitor marketed in pill form for treating erectile dysfunction (ED) under the name Cialis. <context> Tadalafil (INN) is a PDE5 inhibitor marketed in pill form for treating erectile dysfunction (ED) under the name Cialis /siˈælᵻs/ see-AL-iss, and under the name Adcirca /ædˈsɜːrkə/ ad-SUR-kə for the treatment of pulmonary arterial hypertension.