Fentanyl: 7 things you should know - Drugs.com
Sep 29, 2020·Fentanyl should NOT be used in people who have never been prescribed an opioid analgesic (opioid-naive people). Fentanyl is usually only available from a certified pharmacy under a special program. Fentanyl is a schedule II controlled substance and is up to 100 times more potent than morphine on a weight for weight basis.