| abstract |
1. A sustained release composition containing a polymer of lactic acid-glycolic acid having a ratio of weight average molecular weight to pesomolecular number in number of about 1.90 or less, or a salt thereof, and a substance Physiologically active. 2. The sustained release composition according to claim 1, wherein the physiologically active substance is a physiologically active peptide. 3. The sustained release composition according to the. claim 2, wherein the physiologically active substance is a derivative of LH-RH.4.- The sustained release composition according to claim 1, wherein the weight average molecular weight of said lactic acid-glycolic acid polymer is of about 3,000 to about 100,000. |