Banamine is a prescription medication indicated to alleviate pain and inflammation primarily in horses. This medication contains the active ingredient flunixin, a type of NSAID, or non-steroidal anti-inflammatory drug. Banamine may be administered as an injection or oral paste. Horse owners should discuss Banamine side effects with a veterinarian before administering this medication to their horse.
Injection Site Reaction
Horses that receive this medication by intramuscular injection may develop a reaction at the injection site. Injection site reaction characteristics may include swelling, muscle stiffness, skin mass or lump or unusual sweating, according to AnimalShelter.org. These side effects of Banamine are temporary and typically subside shortly after treatment. Horses may develop injection site reactions with each administered dose of Banamine.
Injection Site Infection
Infrequently, certain horses treated with this medication may develop a severe and potentially life-threatening infection at the site of treatment. Affected horses may exhibit severe swelling or deterioration of the treated skin region. Horse owners may notice that the affected skin region is sensitive or tender to the touch. If these side effects occur, affected horses should be evaluated by a veterinarian immediately.
Upset Stomach or Lethargy
Banamine may cause upset stomach side effects in treated horses. These side effects may include nausea, vomiting, diminished appetite or diarrhea, PetPlace.com reports. Stomach complications may contribute to increased fatigue or lethargy in certain horses. Horses that display persistent or severe upset stomach side effects should receive additional care from a veterinarian.
Allergic Reaction
Infrequently, horses treated with this medication for the first time may experience a severe and potentially fatal allergic reaction. Allergic reaction side effects may include vomiting, skin hives, swelling or loss of consciousness. These side effects require emergency veterinarian attention to limit the development of more severe medical complications.



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