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What are opioids and why are they dangerous? - Mayo Clinic
Opioids - Johns Hopkins Medicine
What medications are opioids? - Drugs.com
Opioids | National Institute on Drug Abuse (NIDA)
What Are Opioids? Types, How They Work, Side Effects - Healthline
Opioids (narcotic analgesics) - Drugs.com
Opioids: What They Are, Side Effects & Disorders - Cleveland Clinic
Opioids: using them safely, and finding better ways to manage pain
Prescription Opioids DrugFacts | National Institute on Drug Abuse
About Prescription Opioids | Overdose Prevention | CDC