Source: rx2040. com Cіalis (Tadalafil) Cіalis is most commonly used to treat erectile dysfunction and impotence, which is when a man struggles to maintain an erectіon or cannot get erect at all. It's also sometimes prescribed for an enlarged prostate. Tadalafil is the active ingredient of Cіalis. It improves blood flow to the penіs so that a man can get an e...