Posatex is generally well tolerated, but side effects such as redness or discomfort at the site of application may occur. If your dog’s eardrum is ruptured, Posatex can cause inner ear issues including sudden hearing loss, loss of appetite, vomiting, diarrhea, ear pain, head tilt, and walking in circles. No vet writer or qualified reviewer has received any compensation from the manufacturer of the medication as part of creating this article. All content contained in this article is sourced from public sources or the manufacturer.