Prolonged release composition, process for producing same, pharmaceutical composition, agents and method for preventing or treating disease, or a contraceptive, and for preventing recurrence of breast cancer after operation for premenopausal breast cancer, process for producing a lactic acid polymer - glycolic acid, lactic acid polymer - glycolic acid, use of the same or its salt, and, microsphere

摘要

"Extended release composition, process for producing the same, pharmaceutical composition, agents and method for the prevention or treatment of diseases, or a contraceptive, and to prevent recurrence of cancer for the lower end of the prostate A POLYMER OF Lactic Acid - Glycol Acid, Polymer of Lactic Acid - Glycolic Acid, Use of the Same or Its Salt, and MICROSPHERE ". The present invention is the provision of a sustained release composition which contains a physiologically active substance at high content even when gelatin is not included, and suppresses its initial excessive release and thus can achieve a stable release rate within about of a month. A sustained release composition containing a lactic acid - glycolic acid polymer having a weight average molecular weight to number average molecular weight ratio of about 1.90 or less, or a salt thereof, and a physiologically active substance.