Fildena 150 mg is marketed as sildenafil citrate 150 mg, a PDE-5 inhibitor used for erectile dysfunction (ED). It works by increasing blood flow to the penis during sexual stimulation, helping achieve and maintain an erection. However, 150 mg is higher than the recommended maximum sildenafil dose. Standard prescribing information recommends 50 mg as the usual starting dose, with adjustment to 25–100 mg depending on effectiveness and tolerability. The maximum recommended frequency is once daily.