Vidalista 20 contains 20 mg Tadalafil as its active ingredient. Tadalafil is a drug that relaxes the smooth muscles of the blood vessel walls and increases the flow of blood to various areas of the body. This behavior makes the medication effective in treating men with erectile dysfunction. However, Tadalafil is also used to enhance signs of benign prostatic pyperplasia and improve the ability of people with pulmonary arterial hypertension to exercise and erectile dysfunction.