Filagra 100mg is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, the active ingredient also found in Viagra. Filagra 100 works by increasing blood flow to the penis, helping men achieve and maintain an erection when sexually stimulated. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Filagra 100 is taken orally, usually 30 minutes to an hour before sexual activity. It should not be used more than once a day and should be taken as directed by a healthcare provider for safety and effectiveness.