Methamphetamine (Meth) administered in conjunction with mirtazapine during re-exposure to the Meth-paired chamber on day 17 inhibited the expression of CPP tested on day 20. Rats administered mirtazapine vehicle + Meth (n = 14, left set of bar graphs), expressed CPP (post hoc Newman–Keuls, p < 0.01) whereas rats that received a mirtazapine + Meth (n = 7, right set of bar graphs) did not demonstrate a preference for the Meth chamber (post hoc Newman–Keuls, p > 0.05). In addition, the time spent in the Meth-paired chamber was significantly reduced after Mirt pre-treatment compared to vehicle pre-treatment (post hoc Newman–Keuls, p < 0.05). Time spent in the center chamber is presented for qualitative comparisons, and was not included for the one-way ANOVA statistical analysis. Saline, saline-paired chamber; Meth, methamphetamine-paired chamber; Center, central neutral chamber; Mirt Veh, mirtazapine vehicle (water pH ∼ 6.3; 1 ml/kg); Mirt, mirtazapine (5 mg/kg); M, methamphetamine (1 mg/kg).