Objective： To explore the effects of Chinese medicine prescription Zuogui Pill（左归丸, ZGP） on monoamine neurotransmitters and sex hormones in climacteric rats with induced panic attacks. Methods： Forty-eight climacteric female rats were randomized into 6 groups with 8 rats in each group： the control group, the model group, the low-, medium- and high-dose ZGP groups and the alprazolam group. Rats in the low-, medium- and high-dose ZGP groups were administered 4.725, 9.45, or 18.9 g/kg ZGP by gastric perfusion, respectively. The alprazolam group was treated by gastric perfusion with 0.036 mg/kg alprazolam. The control and model groups were treated with distilled water. The animals were pretreated once daily for 8 consecutive weeks. The behaviors of rats in the open field test and the elevated T-maze（ETM） were observed after induced panic attack, and the levels of brain monoamine neurotransmitters and the plasma levels of sex hormones were measured. Results： Compared with the control group, the mean ETM escape time and the levels of 5-hydroxytryptamine（5-HT） and noradrenalin（NE） of the model group were significantly reduced（P〈0.05）, Compared with the model group, the mean ETM escape time and the 5-HT and NE levels of all the ZGP groups increased significantly（P〈0.05 or P〈0.01）. However, no significant difference was observed in the levels of sex hormones between the groups. Conclusion： Pretreatment with ZGP in climacteric rats may improve the behavior of panic attack, which may be related to increased 5-HT and NE in the brain.
