Posatex is a treatment for Otitis Externa – ear infection. It contains Orbifloxacin an antibiotic, Posaconazole an antifungal and Mometasone an anti-inflammatory corticosteroid. It is a very useful treatment for serious ear infections in dogs which are often mixed infections of bacteria and fungi. These infections are usually very irritating so the corticosteroids relieves the irritation. It should not be used in dogs younger than four months because of a theoretical ill effect on joint cartilage in very young puppies.