Cenforce 100 mg can cause side effects because it contains sildenafil 100 mg, a medicine used to treat erectile dysfunction. Not everyone experiences them, but the higher dose may increase the likelihood of side effects. 1mg +1 Common side effects Headache Facial flushing or feeling warm Nasal congestion or a blocked nose Indigestion or an upset stomach Dizziness Temporary blurred vision or changes in colour perception These effects are often mild and temporary. NHS +1 Serious side effects to watch for Cenforce 100 mg emergency medical help if you experience: Chest pain, fainting, or severe shortness of breath. Sudden loss of vision or hearing. An erection lasting 4 hours or longer. Signs of a severe allergic reaction, such as throat swelling or difficulty breathing. How to reduce your risk Use Cenforce 100 mg only if a healthcare professional has determined it is appropriate for you. Do not take more than one dose in 24 hours. Never combine it with nitrate medicines for chest pain or with other erectile dysfunction medicines such as Vidalista or Vilitra. Avoid excessive alcohol, which can worsen dizziness and make erections more difficult. NHS +1 One important question: Have you already taken Cenforce 100 mg and experienced a side effect, or are you asking before taking it? I can tailor the advice to your situation.