Cenforce FM 100 mg you mean the product marketed as sildenafil 100 mg, medical advice is particularly important for people who have certain heart conditions or take interacting medicines. The evidence-based precautions for sildenafil include: D DailyMed +1 People taking nitrate medicines such as nitroglycerin/GTN or isosorbide. Sildenafil must not be combined with nitrates because it can cause a dangerous fall in blood pressure. D DailyMed People with significant cardiovascular disease, especially if a doctor has advised that ***** activity is unsafe. D DailyMed People taking alpha-blockers or several blood-pressure medicines, because sildenafil can further lower blood pressure. D DailyMed People with severe kidney or liver problems; lower sildenafil doses may be appropriate because drug levels can be higher. D DailyMed Adults over 65, who may also need a lower starting dose. D DailyMed People taking certain interacting medicines, including ritonavir and some strong CYP3A4 inhibitors. D DailyMed Anyone who has previously had an allergic reaction to sildenafil or who has certain eye/vision problems should discuss it with a clinician first. D DailyMed Also, 100 mg is the maximum recommended sildenafil dose for ED and is not the usual starting dose; the usual starting dose is 50 mg, adjusted according to effectiveness and tolerability. D DailyMed If you tell me your age and the medicines/supplements you currently take, I can check the important interactions with sildenafil 100 mg.