The invention discloses a preparation method of
ceftiofur microspheres, and relates to the field of
veterinary drugs, and the preparation method comprises the following steps: 1, dissolving a
polylactic acid-
polyethylene glycol segmented
copolymer as a
carrier material in an
organic solvent; 2, adding
ceftiofur, and stirring and mixing to prepare a dispersion phase; 3, adding the dispersion phaseinto water, adding an emulsifier, and magnetically stirring and emulsifying to obtain an
emulsion; 4, rapidly stirring the
emulsion for a period of time T1, supplementing water, and continuously stirring for a period of time T2 until the
organic solvent is completely volatilized; and 5, centrifuging, washing, collecting and
drying in vacuum to obtain the
ceftiofur microsphere. According to the ceftiofur sustained-release
microsphere disclosed by the invention, a
drug is more uniformly dispersed in a
carrier material, the
drug loading capacity is high, a dispersion
system of
drug particles is reduced by virtue of a nanoscale
microsphere technology, and the ceftiofur sustained-release microsphere has better needle permeability, so that the drug has a stronger sustained-release effect and a longer sustained
drug effect.