Vigora, as the name suggests, gives you vigor and stamina. Being a cheap modified version of Sildenafil Citrate, Vigora, a PDE5 inhibitor,is known for improving the signs and symptoms of premature ejaculation and pulmonary arterial hypertension. The drug mechanism is safe for treating both medical conditions. Vigora, when orally consumed, reacts straight on penile muscles by dilating them and strengthens blood flow in the region. By increasing the amount of nitric oxide (a chemical substance released when an individual is sexually stimulated), it provokes rapid blood flow and offers firm erection for a couple of hours. In the same way, it widens pulmonary arteries and eases pressure which eventually lowers down the severity of pulmonary arterial hypertension.