Tadalista 20 contains tadalafil as the main inactive ingredient. These pills are one of the best drugs used primarily to treat sexual problems such as erectile dysfunction (ED) or impotence. The main reason for this problem is insufficient blood flow in the blood vessels in the penis of men during sexual activity. If left untreated it can have serious side effects on a man's sex life. This medicine is the best for him. It is usually advisable to take this medicine with a glass of water.