Vidalista 40 mg is a medication primarily prescribed to treat erectile dysfunction (ED), a condition affecting men's ability to achieve and sustain an erection during sexual activity. It contains Tadalafil as its active ingredient, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. This medication works by relaxing the muscles in the blood vessels, allowing increased blood flow. When sexually stimulated, thus facilitates an erection.