Use of maropitant for pain management in domestic rabbits (Oryctolagus cuniculus) undergoing elective orchiectomy or ovariohysterectomy

Pain control is a challenge in domestic rabbits (Oryctolagus cuniculus). The objective of this study was to describe the effect of maropitant on pain scores, food intake, and fecal output in domestic rabbits following elective orchiectomy or ovariohysterectomy. Rabbits that underwent orchiectomy or ovariohysterectomy at three institutions were randomly assigned to one of three treatment groups: low-dose maropitant (2 mg/kg SC once), high-dose maropitant (10 mg/kg SC once), and control (1 mL/kg saline SC once). Rabbits were monitored using video surveillance postoperatively. Pain scores were assessed by three blinded observers, and results were grouped into time frames after surgery. Food intake and fecal output were measured until discharge. There were no local side effects with maropitant administration. There were no statistically significant differences between groups with regard to pain behaviors. An inverse trend was noted between increasing maropitant dosage versus food intake and fecal output, which was not statistically significant. Maropitant at 2 mg/kg SC and at 10 mg/kg SC failed to significantly reduce pain when compared to control group.