Fildena 150 mg contains sildenafil 150 mg, I would not consider it a safe routine dose for erectile dysfunction without medical supervision. The usual sildenafil starting dose for ED is 50 mg. The maximum recommended dose is 100 mg once per day. Official prescribing information lists 25, 50, and 100 mg strengths—not 150 mg. Taking 150 mg increases the risk of side effects such as headache, flushing, dizziness, indigestion, low blood pressure, and visual disturbances. Never combine sildenafil with nitrate medicines such as nitroglycerin or isosorbide; this can cause a potentially dangerous drop in blood pressure. Bottom line: Don't take Fildena 150 mg simply because a lower dose isn't working. A doctor should determine whether a different dose or another ED treatment is more appropriate.