I-131 is a treatment for cats with hyperthyroidism. It involves an injection of radioactive iodine, as prescribed by Board Certified Veterinary Cardiologist Dr. Jonathon Goodwin, given under your cat’s skin, absorbed into the body, and concentrated in the thyroid gland. The cat remains in a designated ward in the hospital for at least 4 days until the radiation level is low enough to go home. Once at home, additional and simple precautions are taken for a few weeks to limit radiation exposure from your cat.

I-131 Treatment for Cats