Vidalista 20 mg, which is released by the Nitric oxide body in response to sexual stimulation, relaxes the muscles in the penile blood vessels and increases blood flow, giving men an erection. The tadalafil in Vidalista 20 mg inhibits PDE5, which increases cGMP and relaxes the smooth muscle in the blood vessels of the penis, boosting blood flow and causing an erection. Since Vidalista 20 mg contains tadalafil, it is categorized as a PDE5 inhibitor. These drugs suppress the PDE5 enzyme. Do not take more than one pill of the prescribed medication within 24 hours after the previous dosage to avoid the symptoms of overdosing.