Silagra 50 mg (sildenafil) can cause side effects, although many people have none or only mild effects. Common side effects Headache Facial flushing or feeling hot Indigestion/heartburn Nausea Stuffy nose Dizziness Temporary changes in vision, such as blurred or altered color perception Silagra 50 mg urgent medical attention if You develop chest pain You have sudden loss or significant decrease of vision You have sudden hearing loss You have an erection that is prolonged or painful, particularly lasting more than 4 hours Important: Never take sildenafil with nitrate medicines (such as nitroglycerin or isosorbide) or recreational “poppers,” because blood pressure can fall dangerously low. If you tell me your age and any medicines you currently take, I can check the important interactions with Silagra 50 mg.