Though Tresaderm is useful for de-worming and in treating fungal infections of the nasal cavity, it is not recommended to use this product as it has many side effects. As it is not effective for viral infections, it is very important to precisely diagnose the condition before initiating the medication. It should not be used for more than a week, and is only for external use in dogs and cats. Take care to avoid contact with the eyes of the animals while administering this medicine. Tresaderm should be refrigerated.