The brand name for the generic medication tadalafil is Vidalista 20, and it is used to treat erectile dysfunction in men. Although males seeking a more convenient and approachable means of treating their erectile dysfunction now have access to over-the-counter alternatives, Vidalista has been available on prescription for over 20 years. Products promoted as over-the-counter (OTC) Vidalista substitutes make the claim that they can help men with ED achieve and sustain an erection. These products are not FDA-approved and cannot be used in place of prescription Vidalista, which contains tadalafil.