Vidalista 40 contains Tadalafil, a drug classified as a phosphodiesterase type 5 (PDE5) inhibitor. Its primary function is to enhance blood flow to the penis, aiding in the attainment and maintenance of an erection. Unlike some ED medications that act for a few hours, Tadalafil’s effects can last up to 36 hours, earning it the nickname "the weekend pill." This extended window allows for more spontaneity in sexual activity, potentially reducing performance pressure.