This is a multicenter, randomized, double blind, double dummy, comparative, active-controlled trial designed to assess the analgesic activity and safety of intravenous doses of parecoxib 40 mg relative to intravenous doses of ketoprofen 100 mg for the treatment of renal colic in outpatients presenting at emergency room settings. This trial is designed to show non-inferiority of parecoxib related to ketoprofen.