Cenforce Professional you mean the erectile-dysfunction tablet commonly marketed as containing sildenafil, it may be suitable for some men with ED—but it isn't automatically safe or appropriate for everyone. Do not take it without medical advice if you: Use nitrate medicines such as nitroglycerin/isosorbide, because the combination can cause a dangerous drop in blood pressure. Take riociguat. Have significant heart Cenforce Professional or have been told that sexual activity is unsafe. Have very low blood pressure or certain serious medical conditions. Common side effects of sildenafil include headache, flushing, indigestion, nasal congestion, and dizziness. An erection lasting more than 4 hours requires emergency medical attention. If you tell me your age, the strength of Cenforce Professional (e.g., 50 mg or 100 mg), what other medicines you take, and whether you're using it for erectile dysfunction, I can tell you whether there are any obvious safety concerns.