Tadacip 20 is a drug used to treat erectile dysfunction or impotence in men. The main ingredient named tadalafil plays an important part in this medicine. This drug helps to increase the blood flow to the penile muscles by relaxing the blood vessels. This medicine is taken one hour before sex. This medicine is taken only once in 24 hours. Fatty food or cold drinks should not be consumed after taking this medication, as it slows down the effect of the medication.