The Acute Pain Service (APS) at Sunnybrook has been using Gabapentin 200 mg three times a day (TID) resulting in anecdotal benefits in terms of analgesia and opioid sparing effects. Higher doses of Gabapentin were associated with an increased incidence of sedation. The purpose of the study is to investigate if Gabapentin 200 mg given three times a day for 72 hours (9doses) results in a reduction in the total amount of opioid required after radical prostatectomy surgery as compared to placebo, and if analgesia is improved. This study will also examine the possible anxiety sparing effects and any health related quality of life (HRQL) changes, which may be a result of our perioperative use of gabapentin.