Filagre is a medication used to treat erectile dysfunction (ED) in men. It contains Sildenafil Citrate, which is the same active ingredient found in other ED medications like Viagra. Sildenafil Citrate works by inhibiting the enzyme PDE5, which helps relax the blood vessels in the penis, allowing increased blood flow. This enables men to achieve and maintain an erection when sexually aroused. Avoid using Filagre if you're already taking nitrate-based medications for chest pain, as the combination can cause a dangerous drop in blood pressure.