Tilmicosin injection and preparation method thereof

The invention provides a tilmicosin injection. The tilmicosin injection comprises tilmicosin and a pharmaceutically acceptable organic solvent, wherein the pharmaceutically acceptable organic solvent is selected from one or more of alpha-pyrrolidone, ethanol, propylene glycol, dimethylformamide and benzyl alcohol. In addition, the invention also provides a preparation method. According to the tilmicosin injection, tilmicosin with the content larger than 98% can be adopted as a raw material for production, compared with tilmicosin phosphate (with the content smaller than 77%), the use amount of the raw material in liquid medicine is greatly reduced, and the viscosity of the liquid medicine is greatly reduced to a certain degree. 本发明提供一种替米考星注射液，包括替米考星、药物上可接受的有机溶媒；其中所述药物上可接受的有机溶媒选自α-吡咯烷酮、乙醇、丙二醇、二甲基甲酰胺、苯甲醇的一种或几种。另外，还提供其制备方法。本发明替米考星注射液，可以采用含量大于98％替米考星作为原料进行生产，相比使用磷酸替米考星(含量低于77％)大大减少了药液中原料的使用量，在一定程度上大大减少药液的黏稠度。