ExoticRx · exoticrx.com/drugs/radioactive-iodine-i-131
I-131
Radioactive iodine concentrated by thyroid tissue. Beta radiation destroys hyperplastic/neoplastic thyroid cells while sparing normal tissue.
Gold standard for feline hyperthyroidism (95% cure rate with single dose). Requires licensed facility and isolation period (1-4 weeks). Hypothyroidism risk (<5%). No daily medication needed.
Species references:All Cat (Domestic) drugs
Each ExoticRx dose rule is graded by the strength of its primary evidence — see the editorial process.
A dog/cat sample is shown here. Cited dosing for all 1 species — reptiles, birds, pocket pets, livestock, and equine — is free on the per-species pages above. Pro adds the weight-based calculator for every species.
| Species | Route | Dose | Frequency | Evidence | Source |
|---|---|---|---|---|---|
| Cat (Domestic) | SC | 0 mg/kg | Single dose (variable mCi) | Strong | Plumb's Veterinary Drug Handbook, 9th Ed |
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