They're different drugs. You'll definitely want the pain relief Fentanyl provides if you're getting cut open, such as for endoscopic surgery. (Fentanyl gets a

They're different drugs. You'll definitely want the pain relief Fentanyl provides if you're getting cut open, such as for endoscopic surgery. (Fentanyl gets a bad rap because it's very dangerous as a street drug. In a healthcare setting it's a wonder drug, superior in almost every way to morphine.)