Unfortunately there are no over-the-counter meds that I know of that have antibiotics in them that I know are safe for the ear....sorry. Antibiotics are usually needed to control an infection. HOWEVER, in a pinch, you can buy an over-the-counter cleaner. You can find cleaners just about anywhere that carries pet supplies. Just the very fact of cleaning the ear a couple of times a day may help a problem from getting worse and may help a minor infection.