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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years.
Gentamyacin, the active ingredient in gentizol can be ototoxic... this means that if it gets into the inner ear it can cause hearing loss. Usually the ear drum will prevent this from happening, but if the ears are very infected or chronically infected, the ear drum may be damaged and allow some medication to leak into the inner ear.In generally, the ototoxicity is considered to be very low.... for example they have done studies where they put it in dog with ruptured ear drums and only a very few developed deafness.
If the deafness if from the medication and you catch it early and stop the medication, hearing will sometimes return. It sounds like you have stopped the medication. The question is.... was it the medication or the infection that caused the deafness. Are the ears still infected? If so, oral gentamyacin will not likely penetrate well enough to cure the infection. You should be flushing the ears themselves daily with saline and antibiotics that are safe even with a damaged ear drum... such as enrofloxacin.
I hope that helps, but if you have additional question please let me know.
Talk to your veterinarian about getting a flush that is safe in the ears and then wait and see if any hearing returns. There isn't a lot more to do at this point