(HealthScoutNews) -- Viagra may be the newest treatment for male erectile dysfunction and, it won't surprise you to know, it is also the costliest.

• Second highest in cost are papaverine injections into the penis, at $384,624.

• Next are suppositories inserted into the urethra, at $266,483.

• Testosterone patches have an estimated cost of $81,866.

• And last come reusable vacuum devices, which cost $51,930.

The study assumes a managed-care plan with 100,000 enrollees and accounts for the costs of medical evaluation, treatment and follow-up examinations.