Tadalista uses a drug called Tadalafil. This drug is taken 1 hour before sexual activity. Increases blood flow to the penis by going to the male's vagina so that the male can get an adequate erection during sexual activity. Tadalista 20 tablet is a medicine made from an active ingredient called tadalafil which is useful for you in the disease of impotence but you should not use it excessively to get rid of this disease as even high doses of the drug