The modified new drug (505b2) is a drug which optimizes its structure, dosage form, prescription & process, administration route, indication et al., on the basis of known active ingredients, and has obvious clinical advantages. The modified new drug is the improvement of the marketed drugs, which emphasizes the "better efficacy". It has the advantages of high success rate, high return, low risk and long life cycle, and has become one of the key areas of new drug research and development in the world.


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