The invention discloses a preparation method of a long-acting hydrochloric
ceftiofur injection. The preparation method is characterized by including: using
soybean oil as a
solvent, heating the
soybean oil to 140-150 DEG C, holding the temperature for 60min for sterilizing, and cooling to
room temperature; dissolving or dispersing 0.5-2.0wt% of and 0.5-1.5wt% of according to prescription amounts in 70-80% of the sterilized
solvent; guiding into a
colloid mill for
grinding, adding 10.2-10.8wt% of hydrochloric
ceftiofur according to a prescription amount after
grinding is finished, adopting a mode of alternating circulating
grinding and non-circulating grinding for grinding, checking whether particle
fineness reaches 2.5-5.0um or not, stopping grinding after requirements are met, and adding the sterilized
solvent to the prescription amount to obtain an
intermediate product; testing
ceftiofur content and product character of the
intermediate product, after passing needle drawing experiment, filling, externally packing, warehousing, and obtaining the injection after passing tests of content,
sterility,
granularity and related matter. Results show that when consumption of and is 1%, production process and product quality of the injection are stable.