Issue: 2020 > December > case report

An uncommon side effect of thiamazole treatment in Graves’ disease



CASE REPORT
D. van Moorsel, R.F. Tummers-de Lind van Wijngaarden
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Abstract

Thionamides (such as thiamazole/methimazole) are a common first line treatment for Graves’ disease. Common side effects include rash, urticaria, and arthralgia. However, thionamide treatment has also been associated with a variety of auto-immune syndromes. Here, we describe a patient presenting with mild arthritis after starting thiamazole. Although severe presentation warrants acute withdrawal of the causative agent, our case suggests that milder forms can be successfully treated with anti-inflammatory drugs alone. Recognition of the syndrome is key to warrant timely and effective treatment.