Sildenafil acts as the main ingredient in Silagra 100 tablets. Silagra is taken to you one hour before sex, after which its effect lasts for 5-6 hours. Silagra 100 is taken one hour before sex, after which the effect lasts for 5-6 hours. It is important to consult a doctor before taking Silagra 100 Mg. Silagra 100mg is widely used by men.