Tadalista 20 mg is used by men with impotence. This drug contains an active ingredient called tadalafil which works to increase the blood flow to the penis in men. This medicine is based on prescription. Before buying this medicine, you should read and understand all the information on its insert and label. If you do not understand the information, you can ask your pharmacist or your doctor for information. This medicine is not for children below 18 years and women.