Cenforce 120 contains Sildenafil for erectile dysfunction. While generally safe when used correctly, some warning signs indicate serious reactions. Stop taking Cenforce 120 and seek medical help if you notice: Erection lasting more than 4 hours (priapism) – can cause permanent damage. Severe chest pain, pressure, or irregular heartbeat – may signal heart problems. Sudden vision changes – like blurred vision or partial loss of vision. Sudden hearing loss or ringing in the ears. Severe dizziness or fainting. Severe allergic reactions – swelling of the face, lips, tongue, or difficulty breathing. Severe headache or nausea with flushing that does not go away. Extra precautions: Do not take more than one dose in 24 hours. Avoid mixing with nitrates, alcohol, or other ED drugs. Bottom line: Cenforce 120 is safe only when used as prescribed. Any of the above signs require stopping the medicine immediately and seeking urgent medical attention.