Vidalista 40 is a medication that contains tadalafil, which is commonly used to treat erectile dysfunction (ED) in men. Tadalafil works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), leading to increased blood flow to the penis during sexual arousal. This helps men achieve and maintain an erection. It is typically taken about 30 minutes before sexual activity and can remain effective for up to 36 hours, allowing for more spontaneity.