VSS Cat Specialist Services Brisbane

Hyperthyroidism Treatment for Cats

Comparison of Treatment Options for Hyperthyroid Cats

 Radioactive iodineAnti-thyroidal drugs e.g. methimazole, carbimazoleLow-iodine dietSurgical removal of the thyroid glands
Initial costHigherLowerLowerHigher
Long term costLowerHigher - life-long medication & regular blood testsModerate - life-long medication & regular blood testsLow
Specific RequirementsIsolation in licensed facility for 5-7 daysNoneIndoor only cat, ability to control dietary intake of catRequires surgeon experienced in technique
Considered a definitive treatment (I.e. possibility for all abnormal tissue to be removed or destroyed)YesNoNoYes
Ease of use for ownerAfter treatment must be kept indoors for a further 2 weeks thereafter easy.Ability to medicate the cat either with tablets or ointmentEasy if they like the foodEasy. May need short period of medical therapy to stabilise prior to surgery and short period of medical therapy for pain relief after surgery
Anaesthesia requiredNo. Some cats require light sedationNoNoYes
Time to normalising thyroidDays to weeks2-4 weeks6-8 weeksWithin 1-2 days
Hospitalisation requiredYes

5-7 days, then indoors for 2 weeks.
NoNoYes, 2-3 days
Risk of low blood calciumNoNoNoYes, if both glands removed
Possible disadvantages or complicationsHypothyroidism or persistent hyperthyroidism possible (2% of treated cats)Owners must medicate their cat daily. Mild side effects are common. Severe side effects are possible. Hypothyroidism can occur.

Increased risk of transition from thyroid adenoma to thyroid carcinoma
Cats not liking the food, persistent hyperthyroidism is relatively common, can be difficult if multiple cats in the householdRecurrence of disease is possible after removal of one or both glands. Hypothyroidism is possible (low thyroid levels)


Address 1-15 Lexington Rd,
Underwood, QLD, AU, 4119

PhonePh: 1300 228 377

Hours Monday-Friday: 8 am-6 pm
Saturday/Sunday - Closed

Veterinary Specialist Services