Vidalista Black 80 belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Tadalafil, its active component, is designed to relax blood vessels and improve blood flow. While primarily used to treat erectile dysfunction, Tadalafil has also been used to treat conditions like pulmonary arterial hypertension. The medication works by inhibiting the enzyme PDE5, which can restrict blood flow, thus allowing for improved circulation.