Abstract: A gallstone dissolver comprises the following active ingredients (A) and (B);(A) a compound selected from the group consisting of fatty acid monoglycerides of C-6 to C-12, fatty acid diglycerides in liquid phase at 30.degree. C., fatty acid triglycerides in liquid phase at 30.degree. C., and fatty acids in liquid phase at 30.degree. C., and(B) a monoterpene.The coexistence of the fatty acid and monoterpene in the gallstone dissolver accelerates the sulubility and dissolving velocity of cholesterol gallstones.A nonionic surfactant such as a polyoxyethylene sorbitan fatty acid ester, glycerin fatty acid ester, etc. may also be added to the above dissolver to further improve the performance of the dissolver.