| abstract |
The present invention relates to a complex represented by the formula (I) or a solvate thereof (where n is 1 to 4), a drug composition, and surgical pain, intraoperative pain and postoperative pain of the drug composition. Provide application in the prevention or treatment of pain. According to the technical form of the present invention, a drug which has a simple production process and can stably release a local anesthetic in the body for a long time is provided. The drug can be released continuously for at least 3 days or more, prolong the analgesic effect of post-operative pain, be used conveniently by medical students and patients, and have good administration compliance. [Selection diagram] None |