Fentanyl: The dangers of this potent “man-made” opioid - Harvard Health

Fentanyl is a powerful synthetic opioid. It is far more potent — and potentially more dangerous — than heroin and morphine. Overdose deaths related to fentanyl are on the rise. The drug is cheaper than heroin and recently is being used to dilute heroin or substitute for it. Users may be unaware

The Woman Who Cried Pain: Do Sex-Based Disparities Still Exist in the Experience and Treatment of Pain?, Journal of Law, Medicine & Ethics

Fentanyl heightens a heroin crisis in R.I. - The Boston Globe

Chromogenic and Fluorogenic Probes for the Detection of Illicit Drugs - Garrido - 2018 - ChemistryOpen - Wiley Online Library

Fentanyl vs Morphine

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Fentanyl: The dangers of this potent “man-made” opioid - Harvard Health

Tramadol: The Opioid Crisis for the Rest of the World - WSJ

The Woman Who Cried Pain: Do Sex-Based Disparities Still Exist in the Experience and Treatment of Pain?, Journal of Law, Medicine & Ethics

Morphine - Wikipedia