The invention discloses a lumepirone long-acting
microsphere sustained-release preparation without a release stagnation period in an early stage, which comprises a lumepirone
active ingredient and a medicinal
polymer auxiliary material in a
mass ratio of (1: 4)-(1: 1), the medicinal
polymer auxiliary material is at least one of glycolide-
lactide copolymers with the weight-average molecular weight of 5000-150000 Da, and the
molar ratio of
lactic acid units to
glycolic acid units of the glycolide-
lactide copolymers is (50: 50)-(95: 5). The lumepirone long-acting
microsphere sustained-release preparation without a release arrest phase in the early stage is obtained by specially limiting
drying conditions in liquid and medicinal
polymer auxiliary materials, the release of the lumepirone long-acting
microsphere sustained-release preparation can be maintained for 2 weeks to 1 month without
oral administration of the long-acting sustained-release microspheres of lumepirone capsules, the safety and effectiveness of the
medicine are met, and the sustained-release preparation is suitable for clinical application. Meanwhile, the problems of early-stage long-time stagnant release and early-stage burst release of the long-acting microsphere preparation can be solved, the compliance can be effectively improved, convenience is provided for patients to the maximum extent, and the economic cost is reduced.