The formulation is a microsphere containing no gelatin but a lactic acid-glycolic acid polymer or its salt and an LH-RH (luteinizing hormone-releasing hormone) derivative or its salt, wherein the lactic acid-glycolic acid polymer has a weight-average molecular weight of about 11,600 to about 14,000. 重量平均分子量約11,600〜約14,000の乳酸−グリコール酸重合体またはその塩とLH-RH誘導体またはその塩を含み、ゼラチンを含まないマイクロスフィア。 - 特許庁