Vidalista 20 mg is a tested and approved formula for treating impotency / erectile dysfunction and PAH (Pulmonary Arterial Hypertension). Vidalista20 mg is a medicine which contains Tadalafil as the main ingredient. Tadalafil was approved in the year 2003 for commercial use. There were other medicines in the market for treating erectile dysfunction. However the other medicines were active only for few hours. With Tadalafil the effect stays for more than 36 hours.