How does Vidalista 40 mg tadalafil work? Vidalista 40mg is an effective medicine due to the presence of the active compound tadalafil, which is responsible for curing erectile dysfunction in men. The drug Tadalafil is a known PDE5 inhibitor. The PDE5 enzyme is the main cause of erectile dysfunction because it inhibits the action of a chemical called cyclic guanosine monophosphate. Once a man...