Fildena 150 mg contains sildenafil, a PDE5 inhibitor used to treat erectile dysfunction (ED) in adult men. It works by helping increase blood flow to the penis during sexual stimulation, which may support achieving and maintaining an erection. Fildena 150 mg does not increase sexual desire and requires sexual stimulation to work. Because 150 mg is a higher sildenafil strength, it should only be used when specifically prescribed or recommended by a healthcare professional. Possible side effects include headache, flushing, dizziness, indigestion, nasal congestion, and visual changes. Sildenafil should not be combined with nitrate medicines, as this can cause a dangerous drop in blood pressure. Consult a doctor before use.