Eurycoma lonifolia (pasak Bumi) are widely found in East Kalimantan. Etnobotanically, the roots of this plant were used to decrease gastric pain and anti ulcers, but scientific evidences have not been available yet. The objective of this research was to test the anti-ulcer effect of Eurycoma longifolia against gastric ulcer in rats. Water extract of Eurycoma longifolia’s given to the rats bef…