http://www.holyfamily.tw/Forum/%E5%A5%BD%E6%96%87%E5%88%86%E4%BA%AB/fildena-150-best-solution-for-men-in-ed-822/ Fildena 150 contains sildenafil citrate, a well-known medication for ED that has been thoroughly studied and proven effective. Sildenafil citrate works by blocking phosphodiesterase type 5 (PDE5), an enzyme that breaks down cyclic guanosine monophosphate (cGMP).