Objective:To investigate the restorative effect of Pterocarpus erinaceus(P.erinaceus) and homopterocarpin.an isoflavonoid isolated from it.on indomethacin-indueed disruption in gastric homeostasis in rats.Methods:Adult rats were dn ided into five groups and lasted for 48 h before treatment.Group I received olive oil(vehicle),group 2 received 25 ing/kg indomethaein while groups 3-5 received cimetidine(100 mg/kg).lioniopterocarpin(25 mg/kg) and P.erinaceus ethanolie stem hark extract(100 mg/kg) respectively.After 1 h.all the groups except group 2 were administered 25 mg/kg of indomethacin.One hour later,the rats were sacrificed and the ulcer index and other gaslroprotective indices were evaluated.Results:Indomethacin caused significant injury to the stomach of the rats as reflected in the ulcer indices(9.0±1.4) as compared with that of control(2.0±0.0).Equally,there were significant increases in gastric acid concentration and malondialdehvde level in the stomachs of the ulcerated animals compared with the control.However mucus content,reduced gluthatione level and gastric pH were significantly reduced in the ulcerated animals compared with the control.Pretreatment with either Pterocarpus bark extract or homopterocarpin reversed the effects of indomethaein on the evaluated parameters.Conclusions:These results indicate that both homopterocarpin and Plerocarpus extract offered gastroprotection against indomethacin-induced ulcer by antioxidative mechanism and the modulation of gastric homeostasis.The results also suggest that homopterocarpin might he responsible for.or contribute to the antiulcerogenic property of P.erinaceus. Objective: To investigate the restorative effect of Pterocarpus erinaceus (P.erinaceus) and homopterocarpin.an isoflavonoid isolated from it.on indomethacin-indueed disruption in gastric homeostasis in rats. Methods: Adult rats were dn ided into five groups and lasted for 48 h before treatment.Group I received olive oil (vehicle), group 2 received 25 ing / kg indomethaein while groups 3-5 received cimetidine (100 mg / kg) .Lioniopterocarpin (25 mg / kg) and P.erinaceus ethanolie stem hark extract 100 mg / kg respectively. After 1 h. All groups except group 2 were administered 25 mg / kg of indomethacin. One hour later, the rats were sacrificed and the ulcer index and other gasroprotective indices were. Results: Indomethacin caused significant injury to the stomach of the rats as reflected in the ulcer indices (9.0 ± 1.4) as compared with that of control (2.0 ± 0.0) .Equally, there were significant increases in gastric acid concentration and malondialdehvde level in the stomachs of the ulcerated anima ls compared with the control. Even mucus content, reduced gluthatione level and gastric pH were significantly reduced in the ulcerated animals compared with the control. Pleating with either Pterocarpus bark extract or homopterocarie reversed effects of indomethaein on the evaluating parameters. Conclusions: These results indicate that both offered homoglobulin and Plerocarpus extract offered gastroprotection against indomethacin-induced ulcer by antioxidative mechanism and the modulation of gastric homeostasis. The results also suggest that homopterocarpin might he responsible for. contribute to the antiulcerogenic property of P.erinaceus.