Levothyroxine is an oral thyroid hormone medication used in dogs and cats to treat hypothyroidism or other thyroid conditions due to low circulating thyroid hormone It usually needs to be given for the life of the animal It is given to treat conditions associated with low circulating thyroid hormone hypothyroidism This is a common disease of middle aged and older pets where the animals thyroid gland does not produce enough thyroid hormoneCats dont often receive levothryoxine but may be prescribed it for a short period to correct overtreatment of hyperthyroidism or if their thyroid gland was surgically removedOther products from PetCareRx