Abstract: This invention relates to pharmaceutical compositions for veterinary use in form of aqueous injectable suspensions comprising Florfenicol or Florfenicol in form of a substantially water-insoluble complex, co-crystal or salt, sterile and micronised, in a concentration up to 500 mg/ml. The suspensions enable parenteral antimicrobial therapies in animals, with limited numbers of injections and showing good general- and local tolerances. They also possess a limited sedimentation on standing as well as after shipping, are easily resuspendable and have good syringablity.