Based on my experience with Wick, I also recommend, if finances and rabbit-savvy vet allows it, to continue trying different antibiotics. I’m unsure how often your rabbit sneezes, but Wick had very frequent sneeze attacks and he couldn’t sleep very soundly, so it was important that we did our best to help him.
Start to finish, Wick’s upper respiratory infection took about 4 months to treat, of twice daily antibiotics. We started with one and it didn’t work, switched to another which sort of worked, then added shots on top of the “sort of” antibiotic and that was the right combo to attack the infection in Wick. Different antibiotics treat different bacteria, so it could be you haven’t found the one to do the trick yet. What medications have been tried, and for how long? Did any lessen symptoms at all?
Reduction of hay dust can help lessen nasal irritation. I switched from Kaytee to Oxbow brand, and it made a large difference as well. If you use a dusty litter, you can put a litter screen down to help quell the dust pick-up as well.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.