Tadalafil acts as the main ingredient in the Vidalista drug. Vidalista drug is one of the best pills of ED. Vidalista pills are taken 1 hour before intercourse, after which the effect lasts for 36 hours. Vidalista drug is primarily a drug related to impotence i.e. the difficulties that men experience during sex. The function of the Vidalista drug is usually to deliver blood to the vagina. So you can feel sex better.