Tadalista 20mg is used to treat erectile dysfunction (ED). This problem is also called impotence in men. Erectile dysfunction is a problem in which a person is unable to achieve an adequate erection during sexual intercourse. But the erection action during intercourse with this drug lasts longer. You should take this medicine only once a day. The effect of this drug lasts for 24 to 36 hours. This drug does not cause any side effects, but it can cause side effects if you take action against the drug.