Han Shuai, Mao Hua, Jin Tingting, Yan Rubing, Wang Ziyi, Zhang Jie, Shi Jianwen, Liang Yongxin
OBJECTIVE: To evaluate the effect of berberine on morphine analgesia, tolerance, and hyperalgesia. METHODS: Morphine-induced acute tolerance model: mice received intraperitoneal berberine at doses of 2.5, 5.0, and 10 mg/kg; 30 min later, subcutaneous morphine 10 mg/kg was injected every hour for nine continuous h. Morphine 10 mg/kg alone was administered at 24 and 48 h. Morphine-induced chronic tolerance model: mice received intraperitoneal berberine 2.5, 5.0, and 10 mg/kg; 30 min later, 10 mg/kg morphine was injected subcutaneously for eight consecutive days...
October 2023: Journal of Traditional Chinese Medicine