Abstract: An intestinal juice level regulator comprising, as the active ingredient, creosote or phenolic derivatives constituting creosote. As having the activities to promote the absorption of intestinal juices and/or to retard the secretion of intestinal juices, the active ingredient lowers the intestinal juice level in intestines. As the phenolic derivatives, usable are one or more of guaiacol, creosol, phenol, cresol and xylenol. The regulator is especially effective for retarding the hypersecretion of intestinal juices to be caused by heat-labile or heat-stable enterotoxin of enterotoxigenic Escherichia coli.