If Fildena 150 mg contains sildenafil 150 mg, medical advice is important because 150 mg is above the recommended maximum dose for erectile dysfunction. The usual sildenafil dose is 50 mg, adjusted between 25–100 mg depending on effectiveness and side effects. 100 mg is the maximum recommended dose, taken no more than once in 24 hours. D DailyMed A 150-mg dose can increase the likelihood and severity of side effects such as headache, flushing, dizziness, low blood pressure, visual disturbances, and rapid heartbeat. Sildenafil can be particularly dangerous with nitrate medicines such as nitroglycerin because it can cause a potentially severe drop in blood pressure. D DailyMed If you're taking an alpha-blocker such as tamsulosin or doxazosin, sildenafil can also lower blood pressure; prescribing information recommends starting sildenafil at 25 mg in this situation. D DailyMed Bottom line: 150 mg isn't simply a “stronger” version of 100 mg. For ED, I would not take Fildena 150 mg without a doctor specifically assessing and prescribing it. If you've already taken 150 mg, tell me when you took it and whether you're having any symptoms, and I can tell you what to watch for.