The active ingredient in Vidalista 80mg is Tadalafil, a PDE-5 inhibitor. Tadalafil increases blood flow to the penis by relaxing the muscles and blood vessels in the penis. This medicine should always be taken one hour before sexual activity. Men below 18 years of age should not take this medicine. You should use this medicine 1 hour before sexual intercourse and enjoy a strong erection. If the effect of this medicine lasts for a long time, then you should use this medicine as per the doctor's advice.