Gastric ulcer stays one of the perilous sicknesses in the world. In spite of the fact that there are numerous medications utilized for the treatment of gastric ulcer, the vast majority of these deliver a few adverse impacts. The aim of this investigation was to assess the antiulcer effects of Borago (Borago officinalis L) leaves extract (BL), flowers extract (BF)  and the mixture of leaves and flowers extracts (Mix) against gastric ulcer induced by indomethacin in rats and compared with ranitidine as a reference drug. Gastric ulceration was stimulated by indomethacin at one dose (30 mg/kg b.w. Intraperitoneal (i.p)). BL and BF were administered orally at two doses of 100 and 200 mg/kg b.w, Mix was given orally at a dose of 200 mg/kg b.w. and ranitidine at a dose of 20 mg/kg b.w. for three weeks before the injection of indomethacin. The results appeared that indomethacin significantly decreased pH value, mucin content, catalase activity (CAT) and nitric oxide (NO), while, increased ulcer index, total acidity, free acidity and malondialdehyde (MDA) comparing with control group.While, pretreatment with Borago extracts provided a significant decrease in ulcer index, total acidity,free acidity, MDA, and associated with a significant rise in pH value, mucin content, CAT and NO compared to indomethacin group. The protection provided by the extracts of Borago is similar to ranitidine. Histological studies of stomach mucosa affirmed these outcomes. Borago has protective against indomethacin which caused gastric ulcer because of it contains antioxidant properties. The results of the present suggest that Borago can be  utilized against gastric ulcer impacts as well as to decrease antagonist drugs adverse effects.