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

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

  3. Opioid - Wikipedia

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

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

  6. Understanding the Opioid Overdose Epidemic | Overdose Prevention

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

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

  9. What led to the opioid crisis—and how to fix it

  10. Opioid overdose - World Health Organization (WHO)