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Opium - Wikipedia
Opium (oral route) - Mayo Clinic
Opium | Drug, Physiological Actions, & History | Britannica
Opium: Uses, Addiction Treatment & Side Effects - Drugs.com
Opium: Uses, Effects, and Addiction - WebMD
Opioid (Narcotic) Pain Medications: Dosage, Side Effects, and More - WebMD
Opium - DEA.gov
The Addictive History Of Medicine: Opium, The Ancient Drug Of …
Opium: Uses, Interactions, Mechanism of Action - DrugBank Online