Malegra 100mg contains Sildenafil which belongs to the group of medicines called Phosphodiesterase type 5 (PDE 5) inhibitors. It is used to treat erectile dysfunction in men. Erectile dysfunction (also known as impotence) is a sexual condition where a man cannot sustain a hard erected penis which is required for normal sexual activity. Take this medicine 30 minutes before intercourse so that you can enjoy intercourse with your partner. The effect of this medicine lasts for 4 to 6 hours. You should take this medicine as advised by your doctor. This drug is only taken by men over 18 years of age.