Dosages
Side effects in children
Warnings & precautions in children
Contra-indications in children

Interactions
PK
Renal impairment
References

Thiamazole

Generic name
Thiamazole
Brand name
ATC Code
H03BB02

Pharmacokinetics in children

No information

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dose recommendation of formulary compared to licensed use (on-label versus off-label)

No information is present at this moment.

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Available formulations

No information is present at this moment.

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Dosages

Hyperthyroidism
  • Oral
    • 1 month up to 18 years
      [1] [3]
      • 0.5 mg/kg/day in 2 - 3 doses. Max: 40 mg/day.
      • Titrate based on effect. Once the FT4 level has fallen to the low-normal range, start levothyroxine

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Renal impaiment in children > 3 months

GFR ≥10 ml/min/1.73m2: Dose adjustment not required.

GFR <10 ml/min/1.73m2: A general recommendation on dose adjustment cannot be provided.

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The complete list of all undesirable drug reactions can be found in the national Summary of Product Characteristics (SmPC) – click here

Side effects in children

Side effects mainly occur in the first 3 months of therapy.

Agranulocytosis, neutropenia, myositis, myalgia, arthralgia, skin rashes and impaired liver function (cholestasis). Severe skin hypersensitivity reactions, such as generalized dermatitis including Stevens-Johnson syndrome, have been reported very rarely in children and adolescents (SmPC, Rivkees 2010). The side effects are dose-dependent (Minamitani 2017).

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The complete list of all contra-indications can be found in the national Summary of Product Characteristics (SmPC) – click here

Contra-indications

No information available on specific contra indications in children.

The complete list of all warnings and precautions can be found in the national Summary of Product Characteristics (SmPC) – click here

Warnings & precautions in children

If pruritus / rash is moderate, antihistamines can be administered. Dose reduction or stop of therapy in case of other side effects. (Kahaly, GJ, et al. 2018). Switching to propylthiouracil is not recommended. If inevitable due to thyrotoxicosis, use only for a very short time.

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Interactions

The complete list of all interactions can be found in the national Summary of Product Characteristics (SmPC) – click here

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Thiouracils
H03BA02
Sulfur-containing imidazole derivatives
H03BB01

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References

  1. Noordam C et al, Werkboek Kinderendocrinologie, digitale publicatie op www.nvk.nl (alleen leden), 2010
  2. Teva Nederland BV. , DHPC Carbizol-Thiamazol 31-01-2019
  3. Aspen Pharma Trading Limited., SmPC Strumazol (RVG 02224) 15-02-2019, www.geneesmiddeleninformatiebank.nl
  4. Minamitani, K, et al, Guidelines for the treatment of childhood-onset Graves’ disease in Japan, 2016, Clin Pediatr Endocrinol, 2017, 26(2), 29-62
  5. Kahaly, GJ, et al, European Thyroid Association Guideline for the Management of Graves’ Hyperthyroidism, Eur Thyroid J, 2018, 7, 167–186

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Changes

Changes