tadalista 20 Tablet is a prescription medication used to treat impotence (sexual dysfunction) in men. This medication works by increasing the blood supply to the penis. It helps men to achieve or sustain an erection. You can take tadalista 20 on an empty stomach. You can also take it with a meal. You must take it as directed by your doctor. It should be taken about 1 hour before your sexual intercourse. Drinking alcohol while taking this medication increases the risk of side effects.