Outcomes and Prognosis

Radioiodine Outcomes in Cats | Success Rates & Long-Term Prognosis

Learn about success rates, risks and long-term outcomes of radioiodine treatment for hyperthyroid cats.

What results can you expect?

The outlook for cats treated with radioiodine is excellent. The majority are cured with a single treatment and go on to live normal, healthy lives.

You may have noticed a gradual weight loss in your cat despite a good appetite. Cats can become more restless, vocal, or unsettled, and it is common to see increased thirst, more frequent urination, vomiting, or a decline in coat condition. In some cases, the changes are subtle and develop slowly over time.

A small number of cats (less than 5%) may need further treatment, and in some cases thyroid levels may become too low. This is usually mild and manageable if it occurs, but may require daily medication with a thyroid supplement if thyroid levels do not return to normal. If your cat needs a second treatment, we will do this for free.

A long-term solution

For many owners, radioiodine treatment provides a lasting solution. Without the need for daily medication or ongoing dose adjustments, cats can return to a more natural routine and improved quality of life.

Helpful Links

International Cat Care – Hyperthyroidism in cats