Vilitra 40 mg is marketed as a treatment for erectile dysfunction (ED) and is generally associated with vardenafil, a PDE-5 inhibitor. Vardenafil works by increasing blood flow to the penis during sexual stimulation, which can help some men achieve and maintain an erection. However, 40 mg is above the usual maximum recommended vardenafil dose for ED. Standard prescribing information generally recommends a maximum of 20 mg once daily. A higher dose does not necessarily improve sexual performance and may increase the risk of adverse effects.