Silagra is used for Sexual problems in men such as impotence and erectile dysfunction. This drug contains an ingredient called sildenafil which helps increase blood flow to the penis in men so that men can enjoy sex longer. This drug should only be taken by men over 18 years of age. The effect of this drug lasts for 5 hours. You can also take this medicine before or after a meal. Take this medicine as advised by your doctor. Take this medicine with water but do not break or chew the medicine. Take this medicine 30 minutes before intercourse.