This page is being served from the Urological Sciences Research Foundation web repository, and was originally posted between 1996-2008. In January 2009 USRF’s founder, Dr. Leonard S. Marks and his staff joined UCLA’s Department of Urology where they are continuing their research. Click for more information.

Figure 2. Relationship between the patient's desire to continue sildenafil (vertical axis) and baseline Severity Class (horizontal axis). The more severe the dysfunction, the less likely the patient's desire to continue sildenafil.