Abstract:Epidural injection of single or combined Morphine was used for analgesia on 40patients suffering from sever late cancer pain.Patients were divided into three groups admi nistered with:1,morphine only;2,morphine and ketamine;3,morphine and droperidol.Theresults showed that both of the combined morphine groups were better then sigle morphinegroup in terms of the latency of analgesic effect(9.5min in Group 1 versus 8.2 and 8.4min in Group 2 and 3,P<0.05)and the duration of analgesia(5.23h in Group 1 versus6.73 and 6.90 min in Group 2 and 3,P<0.01).The rssults indicate that the analgesic e ffect of the combined morphine groups is better than that of morphine only group.