The active ingredient in the Tadacip 20 pills is Tadalafil. This tablet is taken one hour prior to sex. The effects of Tadacip 20 are felt for 36 hours after taking it. After taking Tadacip 20, the effects are felt for 3 to 4 hours. this tablet is used by men. It should not be taken by small children or pets. Side Effects of Tadacip 20 side effects is widely used. After taking it, the effects remain. This is one of the most popular Sex Life tablets.