Introduction: Alcohol consumption is frequently associated with gastric mucosa! lesions. The purpose of this study was to determine the effect of Coenzyme-Q(10) (CoQ(10)) supplementation on the ethanol-induced gastric mucosal damage in a rat model.,Material and method: Sixty-four female wistar albino rats were randomly divided into 8 groups (n = 8). Studies were performed in ethanol induced gastric ulcer model in Wistar albino rats. Famotidine at a dose of 5 mg/kg or 20 mg/kg and CoQ(10), at a single dose of 10 mg/kg or 20 mg/kg and 30 mg/kg for 7 days were administered as pretreatment. All the rats in study groups received 2 ml/kg ethanol 95 % intragastrically, 30 minutes after pretreatment. Four hour after ethanol administration, all rats were sacrificed and their stomachs were removed under ketamin anaesthesia. Gastric protection was evaluated by measuring the ulcer index, MDA concentrations, and histopathological studies.,Results and discussion: Rats pretreated either with famotidine or CoQ(10) had significantly diminished gastric mucosal damage which was assessed with gross and microscopic analysis (p < 0.00625). MDA levels were significantly lower in famotidine 20 mg/kg and CoQ(10), pretreatment for 7 days group (p < 0.00625).,Conclusion: CoQ(10) affords gastroprotection against ethanol-induced gastric mucosal lesions in rats especially after repetitive administrations (Tab. 3, Fig. 2, Ref. 35). Text in PDF www.elis.sk.