There's no listing for whether or not that's a safe antibiotic for rabbits or not. If the scratch isn't deep and there's no sign of infection, I would just make sure it's clean and keep an eye on it to make sure no infection develops and it heals well. But if you still feel you need to use something to stop an infection starting, I would use a plain triple antibiotic ointment(neomycin, bacitracin, polymyxin).
If the scratch is deep or infected, your rabbit probably needs to be seen by a knowledgeable rabbit vet, and be put on a rabbit safe systemic antibiotic.