Any long-term side effects from radioiodine for cat hyperthyroidism?

Question

Hi, my cat has just been diagnosed with Hyperthyroidism, I would like to get her the radio iodine treatment but am concerned about any long term side effects, are there any? She is an otherwise healthy girl of almost 13 years old. Thank you, Sue. Pet's info: Cat | Domestic Longhair | Female | spayed | 12 years and 11 months old | 7 lbs

Emily, DVM · Accepted Answer

Usually cats do well with the radio active iodine therapy. There is a chance for them to become hypo thyroid meeting they would need thyroid supplementation after the treatment. But generally speaking most cats do very well and no further treatment is needed. However your veterinarian will need to make sure there's no other underlying issues such as early kidney disease prior to doing the radio active iodine therapy. If they do find other issues then your cat may not be a good candidate for that treatment but other treatments such as daily medication or even surgery to remove part of her thyroid gland might be options.

Any long-term side effects from radioiodine for cat hyperthyroidism?

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