Male erectile dysfunction is treated with Fildena 50 . The inability to get and maintain a sexual erection during activity is known as impotence, or ED. This medication's sildenafil citrate salt is also known to treat pulmonary hypertension in males.   Fildena 50 is a prescription medication that you should take for the recommended amount of time and duration as prescribed by your physician. Keep kids and pets away from it. This medication needs to be stored somewhere dry and cool. Sildenafil Citrate is the active ingredient of the drug Fildena 50, which is used to treat erectile dysfunction. A phosphodiesterase type 5 inhibitor called sildenafil citrate aids in enhancing blood flow to the penis, making it easier to get and keep an erection when aroused sexually.