In the areas of your penis that give you a Hardon, tadarise 20 mg works by relaxing the walls of your blood vessels, enabling blood to flow freely. The active component of Tadarise 20, tadalafil, helps to relax the penile blood vessels, enabling greater blood flow that may aid with erection facilitation. There should be no alcohol or other liquids when using this medication. Anybody who is allergic to any of the substances in Tadarise should avoid using this medication. More serious adverse effects, such as abrupt loss of vision or hearing or an erection that lasts longer than four hours, may occur in some people. Don't drink alcohol because it can make adverse effects more likely.