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The present invention provides a pharmaceutical composition in the form of an aqueous solution comprising magnesium glycerophosphate, citric acid, and sodium benzoate at a certain concentration, respectively, as a preservative and stabilizer. In addition, the present invention provides a method of improving the physical stability of a pharmaceutical composition having an aqueous solution form containing magnesium glycerophosphate, comprising the addition of citric acid and sodium benzoate at a certain concentration.