The effect of Vidalista can be observed only if a man is sexually aroused. After oral consumption, the action of this medication begins within 20 minutes, while, its effect lasts for a duration of 36 hours.The active component, Tadalafil, present in Vidalista inhibits the action of PDE-5 enzyme. The PDE-5 enzyme degrades cGMP. cGMP is an endogenous substance that helps in relaxation of smooth muscles and dilation of the penile arteries. The inhibition of PDE-5 present inside the penile region elevates cGMP levels and thus relaxation of smooth muscles and dilation of the blood vessels takes place. The dilated blood vessels help to improve the blood flow to the penile organ. The increased supply of blood helps a man to achieve a firm and strong penile erection.