A drug called Tadarise is used to treat male erectile dysfunction (ED). The active ingredient, tadalafil, is the same substance that is included in Cialis. Tadalafil helps get and keep a hard erection by relaxing blood vessels and boosting blood flow to the penis during sexual stimulation. Depending on the needs and tolerance of the user, Tadarise is available in a variety of strengths, including 2.5 mg, 5 mg, 10 mg, 20 mg, and even greater doses like 40 mg or 60 mg. Tadarise 20 is one of the longer-acting ED drugs on the market, with effects that last up to 36 hours. It should only be taken once a day, 30 to 60 minutes before engaging in sexual activity. Under a doctor's supervision, some lesser Dosages can be taken every day.