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Amiodarone-Induced Thyroid Dysfunction

Thyroid hormone disorders developing due to amiodarone's high iodine content.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Endokrinoloji department. Book Appointment →

What is Amiodarone-Induced Thyroid Dysfunction?

Amiodarone is an antiarrhythmic drug that can significantly affect thyroid function due to its high iodine content (37% iodine). Thyroid dysfunction develops in 15-20% of users; both hyperthyroidism and hypothyroidism can occur.

Amiodarone-induced thyrotoxicosis is divided into two types: Type 1 (AIT-1) is increased hormone synthesis due to iodine excess in those with pre-existing thyroid disease, and Type 2 (AIT-2) is hormone release from destructive thyroiditis due to direct toxicity. Distinguishing the two types is critical for treatment selection.

Amiodarone-induced hypothyroidism is due to the Wolff-Chaikoff effect of iodine excess and is more common in those with Hashimoto's thyroiditis. Due to the long drug half-life (50-100 days), its effect can persist for months even after discontinuation.

Symptoms

Hyperthyroidism: palpitations, weight loss, sweating
Hyperthyroidism: deterioration in arrhythmia control
Hypothyroidism: fatigue, weight gain, cold intolerance
Hypothyroidism: bradycardia and slowing
Change in goiter
Worsening of heart failure
Muscle weakness
Mental status changes

Risk Factors

Amiodarone use (>3 months)
High dose and long-term therapy
Pre-existing thyroid disease (Hashimoto, nodules)
Living in iodine-deficient regions (for hyperthyroidism)
Living in iodine-sufficient regions (for hypothyroidism)
Family history of thyroid disease
Female sex
Old age

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Thyroid tests before starting amiodarone
  • Palpitations or fatigue during treatment
  • Weight changes
  • Deterioration in arrhythmia control
  • Routine TSH screening every 6 months
  • Cold intolerance and slowing

Treatment Methods

01
Discontinuation of amiodarone (according to clinical situation)
02
Type 1 AIT: methimazole, perchlorate
03
Type 2 AIT: high-dose glucocorticoids
04
Combination therapy in mixed types
05
Levothyroxine in hypothyroidism
06
Thyroidectomy in refractory hyperthyroidism
07
Alternative antiarrhythmic for arrhythmia
08
Regular thyroid function monitoring (every 3-6 months)

Which Department to Visit?

You can visit our Endokrinoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.