Method of purifying plavastatin

摘要

A method of isolating or purifying pravastatin or its pharmaceutically acceptable salt characterized by involving, in the process of isolating or purifying pravastatin or its pharmacologically acceptable salt, the step of extracting pravastatin using an organic solvent represented by the formula CH3CO2R (wherein R represents an alkyl group having 3 or more carbon atoms) or the step of decomposing impurities using an inorganic acid or an inorganic base; and compositions containing pravastatin sodium thus obtained.