Fildena 150 Mg Treat ED Medicine from Australiarxmeds The medication Fildena 150 is used to treat erectile dysfunction (ED) in men. Sildenafil citrate increases blood flow to the penis, resulting in a firmer and longer-lasting erection. It is a medication that is a PDE5 inhibitor. The Red "Triangle Pills" is sildenafil citrate used to treat impotence or erectile dysfunction in males. Sildenafil citrate, the active ingredient in Fildena, is a selective inhibitor of the type 5 (PDE5). Selective inhibition of this enzyme relaxes the smooth muscles of the penile region.