The underlying cause of erectile dysfunction in most men is an insufficient blood flow to the penile area. This causes a lack of an erection and can be attributed to a variety of factors, including stress or depression. Fildena 150 mg tablet is a prescription medicine that improves blood flow and can help with ED. It works by inhibiting the PDE5 enzyme, which prevents it from causing the body to produce cGMP (cyclic GMP) in the blood vessels. This causes an increase in nitric oxide, which increases blood flow to the penile area and helps a man achieve an erection.