Orbax is an FDA-approved broad-spectrum antibiotic that’s used for the treatment of various infections in cats and dogs. While Orbax is approved for administering to pet animals, its use for farm animals, such as horses and rabbits, is categorized as off-label. That means you can give Orbax to treat infections in rabbits. But you need to carefully follow the vet’s instructions regarding dosage, frequency, and side effects. Also, watch out for signs of adverse side effects, such as seizures, incoordination, and labored breathing.