The drug that belongs to the class of PDE5 inhibitors is called Fildena 150 mg. The main cause of sleeplessness is erectile dysfunction, which is treated with this drug. Men lengthen their erections to increase sexual satisfaction. This drug helps men have satisfying sexual encounters by promoting calmness and improving blood flow management in the pelvic organs. The drug Fildena is a 150 mg form of sildenafil citrate, a PDE5 inhibitor.