In this double-blind study, a nasal spray of either the drug (fentanyl -- an opioid analgesic) or placebo (normal saline) is administered before the procedure. There is a 50% chance that patients receive the drug or the placebo. In either case, local Lidocaine jelly is used as an anesthetic in the urethra. Each patient is compensated for time and traveling after the completion of his/her participation.