in pre-procedures as a pain reliever as well as an anesthetic in combination with a benzodiazepine . Fentanyl is approximately 100 times more potent than morphine , with 100 micrograms of fentanyl approximately equivalent to 10 mg of morphine and 75 mg of pethidine (meperidine) in analgesic activity. It has an of 3.1 milligrams per