Keywords: |
unclassified drug; clinical trial; dose response; drug withdrawal; neoplasm; neoplasms; palliative care; palliative therapy; withdrawal syndrome; dose-response relationship, drug; central nervous system; drug dependence; morphine; drug abuse; double blind procedure; double-blind method; analgesia; clinical trials; diamorphine; intramuscular drug administration; injections, intramuscular; etiology; oxymorphone; pentazocine; nalbuphine; butorphanol; morphinan derivative; human; article; nalorphine; metopon; morphinans
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