The present application discloses a
granisetron sustained-release
microsphere and a preparation method therefor. On the basis of the
mass of the
granisetron sustained-release microspheres being 100%, the content of
granisetron or a pharmaceutically acceptable salt thereof is 3-12%, the content of a stabilizer is 1-25%, and the content of a
biodegradable polymer is 65-96%. The
biodegradable polymer is a poly(lactic-co-
glycolic acid), and the stabilizer is a
fatty acid. The granisetron sustained-release
microsphere obtained by the present invention has a high
drug loading capacity, a uniform particle size, a complete morphology and no adhesion, a
smooth surface without obvious pores, and no risk of burst release or
drug leakage, and can achieve sustained release
in vitro for up to 5-7 days.