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I-131 Radiation

Radioactive Iodine Therapy

Radioactive iodine (I-131) therapy is a safe and effective treatment for feline hyperthyroidism. ​

VSP proudly offers Kentucky’s only radioactive I-131 treatment for cats, a safe and effective one-time therapy for hyperthyroidism. During their 5-day stay in our I-131 Treatment Suite, cats relax in spacious condos with cozy cubbies. Fresh food, water, and clean litter are provided daily, and our team monitors them closely to ensure their comfort and safety. 

Benefits:

In about 95% of cases, I-131 therapy cures hyperthyroidism. The treatment is relatively painless and simple. ​

How It Works:

A veterinarian gently administers a small injection of radioactive iodine just under your cat’s skin. This iodine naturally targets the thyroid gland, where it safely eliminates the overactive tissue causing hyperthyroidism, helping restore your cat’s health.

Monitoring:

We carefully monitor your cat’s radiation levels to ensure they are safe to go home, typically 3–5 days after their treatment.

Safety:

During I-131 therapy, your cat will emit a small amount of radiation, so they’ll stay in a dedicated treatment room at the hospital for their safety and comfort. Once home, your cat should stay indoors, and you’ll need to limit close contact for about two weeks to keep everyone safe.

Side Effects:

​In rare cases, some cats may develop low thyroid levels (hypothyroidism), which can be easily managed with daily thyroid supplements, or they may need a second treatment.