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Hi. My name is***** I'm sorry to hear about this current issue with Nunu. I'm also sorry to hear about her reaction to the previous ear medication that was used. The gentamicin in that product can cause an ototoxicity if the ear drum isn't intact and that medication gets to the inner ear. With her rubbing her ears again, there is a very good chance that an ear infection is back. Some can have chronic issues with ear infections due to underlying allergies. I know she had a serious reaction to the previous medications used for that previous ear infection. The best thing to do here is to have her checked over by your vet. They can do a swab of the ear to see if there is an ear infection going on and if it is bacterial or fungal or both in origin. They can also look at the ear drum to see if it is intact. If it is, then topical medications should be safe to use in that ear to treat the situation. If it is compromised, then appropriate oral medications can be used.
Dermapet has an acetic acid-boric acid ear cleaner that is not ototoxic. It has been shown to help treat otitis infections due to yeast. One non ototoxic alkalinizing agent that has primary antimicrobial properties is ethylenediaminetetraacetic acid with TrizEDTA.