Can Zymox Otic HC treat my cat's waxy ears and potential ear mites?

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about Sweetie. Unfortunately Zymox Otic HC contains enzymes and some hydrocortisone. It will help with itching, inflammation, and pain but will not treat ear mites. I would advise letting your vet take a look at Sweetie after getting a thorough history. They can then advise some diagnostic tests to evaluate what is going on with the ears. They can do an ear smear where they take some of the ear discharge, put it on a slide, and examine it under the microscope. Ear mites, bacteria, yeast, and foreign bodies can all cause ear infections/ear problems. Ear mites are contagious to all pets in the household so it's important to diagnose and treat that appropriately. There are topical flea/tick products that also treat ear mites and there are topical ear medicines which can address a variety of ear problems. Good luck with Sweetie.