Filitra is marketed as a brand containing vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED). Vardenafil works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection. It does not increase sexual desire and requires sexual stimulation to work. For standard vardenafil tablets, 10 mg is generally the recommended starting dose, taken as needed about 60 minutes before sexual activity. Depending on effectiveness and tolerability, a healthcare professional may adjust the dose.