I would personally just keep it cleaned with betadine (povidone iodine). Antibiotic based products can really screw with rabbit's GI tract and even cause them to go into stasis in extreme cases.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry