Overview of Hyperthyroidism in Cats

Treatment of feline hyperthyroidism is handled in numerous ways; often depending upon the severity, symptoms, and age of the patient.  Medication therapy is initially begun with a low dose.  A blood work assessment is done a few weeks later.  Depending upon the laboratory results, the dosage may need to be adjusted.  Medication can control the symptoms, but can not cure the disease. 

Even though surgical removal of the thyroid glands can be performed, there are some drawbacks.  The safest and most effective treatment is radiotherapy with radioactive iodine.  Although, this is the safest measure of treatment, it carries advantages as well as, disadvantages.   

In most cases, Methimazole is the drug of choice for treating feline hyperthyroidism; although, other medications may be prescribed, including:

• Levothyroxine 
• Generic brands of levothyroxine
• Thyroid supplementation

Even though, existing feline hyperthyroid medications have therapeutic advantages; they have also been linked to side effects:

• Inappetance
• Vertigo
• Lethargy
• General weakness
• Headache
• Skin irritation
• Sore throat
• Unusual bruising
• Intestinal upset