ExoticRx · exoticrx.com/drugs/radioactive-iodine-i-131
US brand names: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 | Gold standard | Single dose (variable mCi) | Strong | Peterson ME: Radioiodine treatment of hyperthyroidism, Clin Tech Small Anim Pract 21:34-39, 2006.; Peterson ME, Becker DV: Radioiodine treatment of 524 cats with hyperthyroidism, J Am Vet Med Assoc 207:1422-1428, 1995. — Verified against Withrow & MacEwen's Small Animal Clinical Oncology, 5th Ed, p.531 (2026-08-01). |
Upgrade to Pro or Student to unlock the full dose ranges and frequency for every species. The drug's mechanism, warnings, indications, and cited sources are free to read.
View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.