Vidalista is a name for a medication that contains the active ingredient tadalafil. It is primarily used to treat Erectile Dysfunction a condition in which a man is unable to achieve or maintain an erection sufficient for sexual activity. Vidalista belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. The main active ingredient in Vidalista Tadalafil works by increasing blood flow to the penis during sexual stimulation. It achieves this by inhibiting the enzyme PDE5, which is responsible for breaking down a chemical called cyclic guanosine monophosphate (cGMP).