High Quality Sex Enhancement Raw Powder Series Avanafil Description: Avanafil is a PDE5 inhibitor approved for erectile dysfunction by FDA . Avanafil acts by inhibiting a specific phosphodiesterase type 5 enzyme which is found in various body tissues, but primarily in the corpus cavernosum penis, as well as the retina. Other similar drugs are tadalafil and vardenafil. The advantage …