Vidalista 80 is a medication used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). Vidalista 80 belongs to a class of medications called phosphodiesterase type 5 (PDE5) inhibitors, which work by increasing blood flow to the penis or lungs, depending on the condition being treated. In the case of ED, tadalafil helps to relax the blood vessels in the penis, allowing for increased blood flow and thus, an erection. Vidalista 80 does not cause an erection on its own and requires sexual stimulation to work.