Vidalista 40 contains 40 mg of Tadalafil as an active ingredient. Tadalafil is a drug that relaxes the smooth muscles in the walls of blood vessels, thus improving blood flow to certain parts of the body. This action makes the drug effective in treating men with erectile dysfunction. However, Tadalafil is also used to improve the symptoms of benign prostatic piperplasia, improve the exercise capacity of people with pulmonary arterial hypertension.