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carbimazole, carbimazole 5mg
Carbimazole is used to treat hyperthyroidism Carbimazole is a pro-drug as after absorption it is converted to the active form, methimazole Methimazole prevents thyroid peroxidase enzyme from coupling and iodinating the tyrosine residues on thyroglobulin, hence reducing the production of the thyroid hormones T3 and T4 thyroxine


  • 1 Clinical use
  • 2 Precautions
  • 3 Adverse effects
  • 4 Brand names
  • 5 See also
  • 6 References

Clinical use

Therapy for hyperthyroidism generally starts at a high daily dose of 15–40 mg continued until the patient has normal thyroid function, and then reduced to a maintenance dose of 5–15 mg Treatment is usually given for 12–18 months followed by a trial withdraw

The onset of anti-thyroid effect is rapid but the onset of clinical effects on thyroid hormone levels in the blood is much slower This is because the large store of pre-formed T3 and T4 in the thyroid gland and bound to thyroid binding globulin 99% bound has to be depleted before any beneficial clinical effect occurs


Some people are allergic to azoles Some azole drugs have adverse side-effects Some azole drugs may disrupt estrogen production in pregnancy, affecting pregnancy outcome

Carbimazole should be used judiciously in pregnancy as it crosses the placenta It has rarely been associated with congenital defects, including aplasia cutis of the neonate but is not contra-indicated However, it more predictably may cause fetal hypothyroidism so in minimal doses it can be used in order to control maternal hyperthyroidism There are reported cases of goiter and choanal atresia in fetus Furthermore, breast feeding is possible but only if lowest effective dose is used and neonatal development is closely monitored

For the above reasons, it is preferable to use PTU in pregnancy, especially in the first trimester, with the possibility of changing to Carbimazole for the second and third trimesters

Adverse effects

Whilst rashes and pruritus are common, these can often be treated with antihistamines without stopping the carbimazole For those patients where sensitivity reactions can not be controlled, propylthiouracil may be used as an alternative; cross-sensitivity between these drugs is rare

Its most serious rare side effect is bone marrow suppression causing neutropenia and agranulocytosis This may occur at any stage during treatment and without warning; monitoring of white cell count is not useful Patients are advised to immediately report symptoms of infection, such as sore throat or fever, so that a full blood count test may be arranged If this confirms a low neutrophil count, discontinuation of the drug leads to recovery However failure to report suggestive symptoms or delays in considering the possibility of immunosuppression and its testing, can lead to fatalities

Brand names

  • Neomercazole
  • Vidalta
  • Thyrocab

See also

  • Graves' disease
  • Hyperthyroidism


  1. ^ http://informahealthcarecom/doi/abs/101081/ERC-120015045
  2. ^ Goodman & Gilman 12th ed
  3. ^ Bahn RS, Burch HS, Cooper DS, et al July 2009 "The Role of Propylthiouracil in the Management of Graves' Disease in Adults:report of a meeting jointly sponsored by the American Thyroid Association and the Food and Drug Administration" Thyroid 19 7:673–4 doi:101089/thy20090169 PMID 19583480
  4. ^ http://wwwnicholascoid/product/module=detailberita&id=128&act=neo-mercazolehtml/
  • British National Formulary 45 March 2003

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