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  1. Opium - Wikipedia

  2. Opium (oral route) - Mayo Clinic

  3. Opium | Drug, Physiological Actions, & History | Britannica

  4. Opium: Uses, Addiction Treatment & Side Effects - Drugs.com

  5. Opium: Uses, Effects, and Addiction - WebMD

  6. Opioid (Narcotic) Pain Medications: Dosage, Side Effects, and More - WebMD

  7. Opium - DEA.gov

  8. The Addictive History Of Medicine: Opium, The Ancient Drug Of …

  9. Opium: Uses, Interactions, Mechanism of Action - DrugBank Online