Fentanyl in the US: A visual guide
By Deidre McPhillips and Annette Choi, CNN (CNN) — Fentanyl is powerful synthetic opioid that can be up to 100 times more potent than morphine. It can be prescribed in formal medical settings to relieve severe pain and treat breakthrough pain when longer-acting pain medications aren’t enough. Injections may be used during or after surgery,
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