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How Long Does Carbimazole Take to Work?

Andrew Bellingham

Andrew Bellingham

Pharmacist | 20+ Years | BPharm | Dip Clin Pharm

Carbimazole is a medicine that is often prescribed to people suffering from hyperthyroidism, commonly known as an overactive thyroid. 

Having an excess of thyroid hormones in your system can lead to a wide range of distressing symptoms like unexplained weight loss, mood swings and increased heart rate (palpitations). 

Carbimazole intervenes by inhibiting the production of these hormones, which reduces the impact of these symptoms and helps to restore your health and well-being.

How Long it Takes to Work

Though carbimazole gets to work right away, reducing the production of thyroid hormones, it isn’t able to remove the hormones that have already been produced in your body.

This means that you’ll probably start to notice an improvement after a couple of weeks, but it may take between 1 and 2 months before your hormone levels are at a normal level and your symptoms fully subside. 

Common Side Effects of Carbimazole

While these side effects usually improve over time, if they continue to bother you or don’t go away, you should consult with your GP or pharmacist for further guidance: 

  • Nausea (feeling like you’re going to be sick)
  • Vomiting
  • Diarrhoea
  • Dizziness 
  • Headaches
  • Skin irritation or inflammation
  • Thinning hair


For more information on the side effects of carbimazole, including the more severe side effects, please visit the official NHS website.

Order Your Prescription Online with Healthera

If you’ve been prescribed carbimazole to treat your overactive thyroid, you can place your prescription order online from your local pharmacy with Healthera.

It only takes a few minutes to set up your prescription for collection or home delivery. 

To get started, simply click the button below: 

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