An object is to provide a pharmaceutical composition containing a compound having an excellent effect of preventing or treating lactic acidosis. Provided is a pharmaceutical composition for preventing or treating lactic acidosis, including, as an active ingredient, a compound represented by the general formula (I) or a pharmacologically acceptable salt thereof : in the general formula (I), R 1 represents a hydroxy C 1 to C 6 alkyl group, a C 2 to C 7 alkanoyl group, a C 2 to C 7 alkanoyl C 1 to C 6 alkyl group, a (C 1 to C 6 alkoxy) carbonyl group, a (C 1 to C 6 alkoxy) carbonyl C 1 to C 6 alkyl group, a carboxy group, or a carboxy C 1 to C 6 alkyl group.