However, the potentiating effect of avanafil at 1 mg/kg was significantly weaker than that of sildenafil (p &lt;0.05).Data suggest that avanafil has a favorable safety profile for erectile dysfunction, which is attributable to its high inhibitory selectivity for phosphodiesterase type 5 against type 6 (retina) and 1 (vessels, etc), respectively, and its short acting pharmacodynamic property.<CopyrightInformation>Copyright © 2013 American Urological Association Education and Research, Inc. Published by Elsevier Inc. All rights reserved.</