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

  2. Meperidine (oral route) - Mayo Clinic

  3. Morphine (injection route) - Mayo Clinic

  4. Morphine (oral route) - Mayo Clinic

  5. Chronic pain: Medication decisions - Mayo Clinic

  6. Butorphanol (nasal route) - Mayo Clinic

  7. Codeine (oral route) - Mayo Clinic

  8. Oxymorphone (oral route) - Mayo Clinic

  9. Acetaminophen, caffeine, and dihydrocodeine (oral route)

  10. Pentazocine (injection route) - Mayo Clinic