Carbimazole
Carbimazole is an antithyroid medication used to reduce excessive production of thyroid hormones in conditions of hyperthyroidism. It is commonly prescribed for Graves' disease, toxic multinodular goiter, and as preparation for thyroid surgery or radioactive iodine therapy. Treatment requires regular blood monitoring to ensure safety and effectiveness.
Carbimazole is an antithyroid drug used to treat overactive thyroid conditions such as Graves' disease.
Key facts at a glance
- ATC
- H03BB01
- RxNorm
- 2020
- Generic
- Carbimazole
- Class
- atc-h03
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- oral
- Forms
- tablet
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treatment of hyperthyroidism, including Graves' disease, toxic multinodular goiter, and toxic adenoma; also used preoperatively to reduce thyroid hormone levels before thyroidectomy or as a bridge therapy before radioactive iodine treatment.
Carbimazole is a prodrug that is converted to methimazole in the body. It inhibits thyroid peroxidase, an enzyme essential for the synthesis of thyroid hormones T3 and T4, thereby reducing thyroid hormone production.
Requires regular blood monitoring (CBC and liver function tests) due to risk of agranulocytosis and hepatotoxicity. Contraindicated in pregnancy unless benefits outweigh risks. Common side effects include nausea, headache, and joint pain. Do not discontinue without medical consultation; thyroid symptoms may worsen.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy