Silagra 100 mg, Silagra 100 mg contains sildenafil 100 mg. 1 1mg +1 Common side effects The most commonly reported effects of sildenafil include: Headache Facial flushing Indigestion/heartburn Stuffy nose Dizziness Nausea Back or muscle pain Temporary visual changes, such as blurred vision or a color tinge D DailyMed +1 At 100 mg, some side effects are more frequent than at lower doses. For example, clinical data report headache in about 28% and abnormal vision in about 11% at 100 mg. D DailyMed Serious side effects Get urgent medical attention for an erection lasting more than 4 hours, sudden loss of vision, or sudden hearing loss. D DailyMed You can read the official sildenafil safety information here: DailyMed sildenafil prescribing information If you're considering Silagra 100 mg specifically, I can also tell you whether 100 mg is too strong as a first dose and compare it with Silagra 50 mg.