Vidalista 20 mg pill contains tadalafil which prevents the phosphodiesterase enzyme from destroying CGMP and causes prolonged erection. The pulmonary arteries also contain the enzyme PDE5 which is why this medicine helps in the treatment of pulmonary hypertension. The generic name of Vidalista 20 mg medicine is Tadalafil. It falls under the group of medicines that are together known as phosphodiesterase type-5 inhibitors. Vidalista 20 mg is used to treat men with increased prostate and erectile dysfunction. It is an early ED medicine to approve for the treatment of benign prostatic hyperplasia.