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Evolution of subclinical hypothyroidism in children treated with antiepileptic drugs

Manuel Castro-Gago1, María Inés Novo-Rodríguez, Carmen Gómez-Lado

  • 1Servicio de Neuropediatría, Departamento de Pediatría, Facultad de Medicina, Universidad de Santiago de Compostela, Santiago de Compostela, Spain. pdcastro@usc.es

Pediatric Neurology
|November 21, 2007
PubMed

Insights

Carbamazepine and valproic acid can alter thyroid hormone levels in children, potentially causing subclinical hypothyroidism. These effects are temporary and fully reversible after discontinuing antiepileptic drug treatment.

Area of Science:

  • Pediatric Endocrinology
  • Clinical Pharmacology
  • Neurology

Background:

  • Antiepileptic drugs (AEDs) are widely used in children.
  • Thyroid hormone levels can be affected by various medications.
  • The impact of specific AEDs on pediatric thyroid function requires detailed investigation.

Purpose of the Study:

  • To assess the effects of carbamazepine, valproic acid, and phenobarbital on thyroid hormone levels in children.
  • To determine if these changes are reversible after AED discontinuation.

Main Methods:

  • Serum levels of free thyroxine, free triiodothyronine, and thyroid-stimulating hormone were measured.
  • Measurements were taken during chronic AED treatment and 3 months post-treatment.
  • Groups included children on carbamazepine, valproic acid, and phenobarbital.

Main Results:

  • Significant alterations in serum thyroid hormones were observed during chronic treatment, particularly with carbamazepine and valproic acid.
  • Some children exhibited subclinical hypothyroidism during long-term therapy with carbamazepine and valproic acid.
  • Thyroid hormone levels normalized completely three months after cessation of AED treatment.

Conclusions:

  • Carbamazepine and valproic acid can induce transient, reversible changes in thyroid hormone levels in children.
  • Subclinical hypothyroidism associated with these AEDs is reversible upon treatment discontinuation.
  • Monitoring thyroid function may be considered in pediatric patients on long-term carbamazepine or valproic acid therapy.

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