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  1. What are opioids and why are they dangerous? - Mayo Clinic

  2. Opioid - Wikipedia

  3. What Are Opioids? Types, How They Work, Side Effects - Healthline

  4. Opioid Basics | Opioids | CDC

  5. Opioids | National Institute on Drug Abuse (NIDA)

  6. Opioids: What They Are, Side Effects & Disorders - Cleveland Clinic

  7. Opioids | Johns Hopkins Medicine

  8. Prescription Opioids DrugFacts | National Institute on Drug Abuse

  9. Opioids: using them safely, and finding better ways to manage …

  10. What are opioids and why are they dangerous? - Mayo Clinic News Network