The invention discloses a phenylbutazone peak shifting sustained release injection. Every 100 g of the phenylbutazone peak shifting sustained release injection is prepared from the following components by weight: 4.0 to 10.0 g of phenylbutazone, 3.0 to 9.0 g of
polyethylene glycol 12000, 5.0 to 13.0 g of povidone C15, 8.0 to 18.0 g of
ethyl oleate, 4.0 to 8.0 g of span 20, 1.0 to 3.0 g of
behenic acid, 0.5 to 2.5 g of
propylene glycol alginate, 0.1 to 2.0 g of
propyl gallate and the balance of
corn oil. The injection contains three kinds of phenylbutazone
drug forms, the
drug is released in different time periods after
intramuscular injection, and the
peak value of
plasma concentration is staggered, so that the effect of staggered-peak release is realized. According to the technology, on one hand, the highest
plasma concentration is reduced, the
liver and kidney metabolism burden is remarkably relieved, and the safety is improved, on the other hand, the effective
plasma concentration maintaining time is prolonged, the administration frequency is reduced, the stress reaction generated in the animal fixing process is reduced, and time and labor are saved. Meanwhile, the invention further discloses a preparation method, the process is easy to convert, and the application prospect is wide.