Sildenafil acts as the active ingredient in Silagra 100 Mg pills. Silagra 100 Mg is taken to you one hour before sex, after which its effect lasts for 5-6 hours. Silagra 100 is widely used. Silagra 100 is widely used by men. Silagra 100 should be kept away from small children and pets. Must be used only once a day.