Fildena 150 Mg is a medication used to treat erectile dysfunction (ED) in men. It's a high-strength version of the active ingredient, sildenafil citrate, which is also the main ingredient in the brand-name drug Viagra. How It Works Sildenafil citrate is a phosphodiesterase type 5 (PDE5) inhibitor. It works by increasing blood flow to the penis when a man is sexually stimulated. This...