Now there's a third option, Rezūm. According to Dr. Harmon, in this treatment, a small scope is used to inject water vapor into the enlarged prostate tissue. The procedure takes place in the office using a local anesthetic to the prostate and urethra and only takes 10-15 minutes. He says following the procedure, patients may need antibiotics and a catheter for a few days. And some patients will see a noticeable improvement in symptoms in just two weeks.