What are the side effects of methimazole?

Methimazole can cause a variety of side effects. Stop taking methimazole and seek emergency medical treatment if you have symptoms of an allergic reaction: hives; trouble breathing; or swelling of the tongue, face, or throat. Call your doctor right away if you experience other serious side effects such as: flu-like symptoms or any sign of infection; stomach pain or nausea; low fever; loss of appetite; dark urine; light stools; jaundice; bloody stools or urine; unusual weakness; bleeding or bruising; or rash or other blistering, peeling, or skin irritation. Call your doctor only if the following side effects are bothersome or persistent: swelling; hair loss; joint, nerve, or muscle pain; mild itchy skin or rash; upset stomach, mild nausea, and vomiting; or dizziness, drowsiness, and headache. In general, you should discuss any side effects that bother you with your doctor.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.