| abstract |
An object of the present invention is to provide a freeze-dried preparation excellent in stability of an amphoteric cephem antibiotic. A lyophilized preparation containing an amphoteric cephem antibiotic and a halide ion selected from chloride, bromide and iodide ions, and the amphoteric cephem antibiotic containing the halide ion A method for producing a stable lyophilized preparation, which is compounded and produced by a lyophilization method, and a method for stabilizing a lyophilized preparation, which comprises mixing the halide ion with an amphoteric cephem antibiotic. [Selection diagram] None |