The literature has shown that I-131 is the treatment of choice for Feline Hyperthyroidism, having a spectacular success rate while avoiding side effects, refractory reactions to Tapazole/PTU, client difficulties in pilling their pets, complications of anesthesia, post-surgical persistence or recurrence and possible surgical damage to the parathyroid glands.

Radiocat’s I-131 treatment program includes x-ray interpretation and an average of 3-5 days hospitalization post-injection. It’s very reasonably priced, and the referring veterinarian performs all pre- and post-therapy workups.

I-131 therapy is ideal for patients who are stable prior to admission, without significant cardiovascular, gastrointestinal, renal, hepatic, endocrine (other than Hyperthyroidism), or neurologic disease. Medical problems should be discussed with Radiocat personnel to determine if I-131 is appropriate for your patient.

For more information and to schedule an appointment:

Please give us a call. We’d be delighted to speak with you about any aspects of the treatment. Remember, one injection of Radioiodine (I-131) is all it takes!

Phone: 1-800-323-9729
Fax: 1-866-788-5201

Important Information regarding referring a patient for I-131 therapy.

  1. Your pre-therapy workup: CBC, Complete Chemistry screen, diagnostic T4 by an outside lab (ie Antech or Idexx), thoracic radiographs within 30 days of the treatment. Urinalysis is highly recommended. If the patient is currently on Tapazole/PTU or Y/D Diet – and has been for more than 30 days – we require a T4 taken seven days after cessation of this medication. Radiocat personnel can suggest a schedule for stopping, being retested, and arriving for therapy. Please supply all previous T4 values, histories for biopsies, cancer, and acute episodes.
  2. Patients MUST be off Tapazole/PTU or Y/D Diet for at least seven days prior to admission for I-131 therapy. Other medications which may interfere with therapy include: ACTH, anticoagulants, antihistimines, antiparasitics, bromides, butazolidine, mercurials, nitrates, penicillin, pentothal, salicylates (large doses), sulfonamides, thiocyanate, and some vitamin preparations.
  3. Patients are admitted for therapy by appointment only.
  4. Patients are hospitalized in the nuclear medicine ward for approximately 3-5 days. Clients cannot visit patients during therapy, nor can patients be removed from the ward until officially released. Clients cannot terminate therapy or arrange for early release once therapy has begun. We’re sorry, but these rules are dictated by federal guidelines on radiation safety.
  5. After admission for I-131 therapy, information on a patient’s daily status will be given by Radiocat personnel.
  6. I-131 therapy includes:
    • Review of all pertinent case records and radiographs.
    • Hospitalization in the nuclear medicine ward.
    • Radioisotope (I-131) and appropriate radiation monitoring.
    • Daily care and feeding (and as much love as we can safely give).
    • As needed follow-up consultations regarding test results between Radiocat and the referring veterinarian.
  7. I-131 Does NOT include:
    • Diagnostic tests performed at your clinic prior to therapy.
    • Emergency medical tests, procedures or medications needed during the patient’s hospitalization for therapy.
    • Post-therapy T4 determination performed at your clinic.
  8. Patients are released to owners according to strict federal regulations. Patients will be excreting a small amount of Radioiodine on release. Clients are instructed before admission – and given written instructions – on the handling of patients for two weeks post-release from therapy. If clients are unable/unwilling to comply with these precautions, they should consider surgical or medical management.
  9. Possible but very rare complications of Radioiodine therapy include:
    • Possibility for patient to become hypothyroid. Rare cases may need exogenous thyroid supplement.
    • Possibility for sore throat or dysphagia. This is usually transient, but a permanent voice change is possible.

We’re excited to help you offer this service to your clients, and we know they’ll be grateful for the care and concern you’ve shown in finding a cure for their pet’s Hyperthyroidism.
Thank you again for your support.

Dr. David S. Herring

Co-founder of Radiocat
Dr. Herring performs all of the Iodine 131 treatments at Florida Veterinary Referral Center in Estero, Florida. Dr. Herring is board certified in veterinary radiology and has received special training which has been reviewed and accepted by either the State Regulatory Agency or the Nuclear Regulatory Commission where applicable.