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What does it do?

Carbimazole is used to reduce the amount of hormone made by your thyroid gland.

How should you take it?

Take carbimazole regularly as directed with a glass of water.

What if you forget a dose?

Take the missed dose as soon as possible and continue as directed.

Can you take other medicines?

Some medicines available without a prescription may react with carbimazole including:

  • iodine supplements (e.g. Iodine/Lugol’s solution®)

Tell your pharmacist or doctor about all medicines or treatments that you may be taking including vitamins, herbal products (e.g. kelp powder) or recreational drugs. Avoid foods such as seaweed or kelp that may contain iodine.

What side effects might you notice?

Side EffectsRecommended action

Reduced number of blood cells that fight infections or help your blood to clot - symptoms include: fever, chills, sore throat or generally feeling unwell, or easy or unusual bruising or bleeding

Symptoms of liver problems including: yellow skin or eyes, itching, dark urine, pale bowel motions, abdominal pain

Tell your doctor immediately

Headache

Hair loss or thinning

Joint, muscle or bone aches and pains

Stomach upset

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you have liver problems, or a blood disorder.
  • Women should use reliable contraception while taking carbimazole. If you plan to get pregnant, or find you are pregnant, contact your doctor. Tell your doctor if you are breastfeeding.

This leaflet contains important, but not all, information about this medicine.

Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. October 2020

For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?

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About My Medicines

My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.

For more information about the sheets, see: What does a My Medicines sheet cover?

My Medicines is developed by a team at the Canterbury District Health Board. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed