Cenforce is a brand of medicine commonly containing sildenafil, the same active ingredient as Viagra, used to treat erectile dysfunction (ED). Some Cenforce products have different strengths or ingredients, so check the packaging. Who should avoid Cenforce? You should not take Cenforce without medical advice if any of the following apply: You take nitrate medicines for chest pain, such as nitroglycerin or isosorbide, or use recreational nitrates (“poppers”). The combination can cause a dangerous drop in blood pressure. Cenforce have serious heart problems, unstable angina, or have recently had a heart attack or stroke. You have low blood pressure or uncontrolled high blood pressure. You have severe liver disease or certain kidney problems. You have previously experienced sudden vision loss associated with a condition called NAION. You take other erectile dysfunction medicines, such as Viagra, Malegra, Silditop or tadalafil products. Combining them can increase the risk of adverse effects. You take certain interacting medicines, including some alpha-blockers and medications that affect sildenafil metabolism. Common side effects Headache and facial flushing Indigestion or nasal congestion Dizziness Temporary visual disturbances Seek emergency care for chest pain, sudden vision or hearing loss, or an erection lasting more than four hours.