What are the dangers of radioactive iodine treatment?
If lots of hyperactive thyroid cells die and release their stored thyroxin, the cat’s already fast running systems go even faster. A slight risk exists that the cat will have a significant abnormal heart rhythm or increase in blood pressure for 2-3 days after the injection. We watch your cat closely to prevent serious reactions. An occasional cat has a sore throat or hoarse voice for 7 to 10 days. Rarely the iodine will kill all thyroid cells and the cat will need oral thyroid hormone supplementation.
