fildena 150mg belongs to a class of drugs called PDE-5 inhibitors. These drugs regulate blood flow in the pelvic organs and help men feel sexual pleasure. Men who suffer from erectile dysfunction (ED) do not have enough blood in the pelvic organs, which can lead to dissatisfaction with sex. The drug can also be used to treat pulmonary arterial hypertension. There is no need to worry if you are concerned about the side effects of Fildena 150.