Malegra 100 is a prescription medication. This medication is used to treat impotence in men. The active ingredient in these tablets is Sildenafil citrate. These pills can help men have long-lasting sexual erections with their partners. These are tablets that should be taken as directed by your doctor. These tablets are used 30 minutes or 1 hour before sexual activity. Malegra 100 tablets have an impact that lasts for 4-5 hours.