Hi, I've recently taken my two cats to the vet for itchy ears. After evaluating them, she found no signs of ear mites, but said my male cat had a slight ear infection. So she put them both on Tresaderm ear drops in case of mites, and to clear up the infection. After starting this medication, I decided to look into possible side effects, and to my surprise several pet owners claimed their pets became deaf, after using this medication. Please let me know if anyone has used this medication on their cat, with the result of deafness!!