Tadarise 20 is used to treat men who have erectile dysfunction (also known as impotence). Tadalafil works by increasing the flow of blood to the penis during sexual intensity. This can cause an erection due to increased blood flow. Usually, this medicine starts working within 30 minutes of taking it. It works for four to six hours. This medicine should be taken only after consulting a doctor. With this medicine you can have sex for longer.