My cat has hyperthyroidism. Is A131 safe? How long is quarantine?

Question

My 13 year old cat was just diagnosed with hyperthyroidism. The research online suggests that the A131 treatment is a safer option bc there are no side effects and it’s a curative solution. Are there really no risks to this treatment? Also, I read they have to be quarantined but I cant find anywhere that says for how long. What are your thoughts on that treatment option? My cat does have a heart murmur and slight wall thickening but just had his third echocardiogram and is not yet on any meds. Pet's info: Cat | Mixed Breed | Male | neutered | 13 years and 6 months old | 14 lbs

C. Rathjens, DVM · Accepted Answer

The radiation is good treatment option, however it's important start with the oral pill (methimazole) first to make sure his body tolerates having lower thyroid levels first. When we get the thyroid disease under control sometimes we uncover kidney disease that was always there. The other down sides of A131 are cost, availability of the treatment (you have to go to a facility, this isn't something your vet can do), and the process (needing to stay at the facility, I believe it's 3 days but you'd have to check on the protocol at your local facility).

My cat has hyperthyroidism. Is A131 safe? How long is quarantine?

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