OBJECTIVE: To study the analgesia effect of doxepin on the bone cancer pain rats. METHODS: Of total 90 rats, 10 rats were included in normal group and other 80 rats were injected with Walker256 cell to build the bone cancer pain model. Then those model rats were divided into model group, morphine group (1 000 μg·kg-1) and doxepin groups (3, 10, 30, 100, 300, 1 000 μg·kg-1). Those groups were given relevant medicine intrathecally. The pain thresholds of bilateral foot of rats were detected at 0.5, 1, 2, 4 h after medication, and maximum analgesia effect of doxepin was calculated. RESULTS: Doxepin and morphine exerted analgesia effect at 0.5 h, and reached the top at 1 h. Contralateral paw pain thresholds in doxepin groups had no significant change, and the increase of ipsilateral paw pain thresholds was positively related with dose; maximum analgesic efficacy of doxepin (1 000 μg·kg-1) was 67.7%, and median effective dose was 46.6 μg·kg-1. There was no significant difference in the analgesic effect between doxepin 1 000 μg·kg-1 group and morphine 1 000 μg·kg-1 group. CONCLUSION: Doxepin has beneficial effect of analgesia for bone cancer pain rats.%目的:研究多塞平对骨癌疼痛模型大鼠的镇痛作用.方法:取大鼠90只,其中10只为正常组,另80只胫骨注射含人乳腺癌Walker 256细胞株的大鼠细胞液建立骨癌疼痛模型,待模型成功稳定后分为模型组、吗啡组(1 000 μg·kg-1)、多塞平(3、10、30、100、300、1000μg·kg-1)组,鞘内给予相应药物,考察给药后0.5、1、2、4h时各组大鼠的双侧脚痛阈值,并计算多塞平的最大镇痛效应.结果:多塞平与吗啡在给药后0.5h即产生镇痛作用,给药后1h镇痛作用达到高峰；多塞平各剂量组大鼠造模对侧脚痛阈值无明显变化,造模同侧脚痛阈值升高与剂量呈正相关；多塞平1 000 μg·kg-1的最大镇痛效应为67.7％,半数有效量为46.6 μg·kg-1,与吗啡1000μg·kg-1的镇痛效应比较无明显差异.结论:多塞平对骨癌疼痛模型大鼠具有镇痛作用.
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