Fildena XXX functions by blocking the phosphodiesterase type 5 (PDE5) enzyme, which breaks down cyclic guanosine monophosphate (cGMP) in the p*nis' corpora cavernosa. When paired with sexual stimulation, this inhibition produces large levels of cGMP, which relaxes the smooth muscles of the penile blood vessels and increases blood flow, resulting in an erection. To guarantee safe and efficient treatment with Fildena XXX, it is imperative that you tell your doctor about all of your existing drugs and medical history.