Doxycycline, a broad-spectrum tetracycline antibiotic, treats various bacterial infections in horses. Its effectiveness stems from its ability to inhibit bacterial protein synthesis, halting their growth and reproduction.
Veterinarians commonly prescribe doxycycline for:
- Respiratory infections like pneumonia caused by Mycoplasma and Pasteurella species. Genitourinary infections, particularly those involving Brucella or E. coli. Skin infections, including those caused by Staphylococcus and Streptococcus. Treatment of Lyme disease, transmitted by ticks. Certain types of equine leptospirosis.
Dosage varies based on the horse’s weight and the specific infection. Always follow your veterinarian’s instructions precisely. They will consider factors like the severity of the infection and the horse’s overall health. Incorrect dosing can lead to treatment failure or adverse effects.
Administering doxycycline is usually straightforward. It’s available in various forms, including oral tablets, capsules, and injectable solutions. Your vet will guide you on the preferred method and frequency.
Potential side effects, although infrequent, include gastrointestinal upset (diarrhea, vomiting), loss of appetite, and photosensitivity (increased sun sensitivity). Report any unusual reactions to your veterinarian immediately.
Doxycycline’s use requires careful consideration. It can interact with other medications, so always inform your vet about all medications your horse is currently receiving. Furthermore, prolonged use may lead to the development of resistant bacteria. Therefore, responsible and judicious use is paramount.
Always obtain a proper diagnosis from a veterinarian before starting any treatment. Strictly adhere to the prescribed dosage and administration schedule. Monitor your horse closely for any adverse reactions. Complete the full course of treatment, even if your horse appears to be recovering.


