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Related Experiment Videos

Decrease of serum folates in healthy male volunteers taking phenytoin.

M J Berg1, R W Fincham, B E Ebert

  • 1College of Pharmacy, University of Iowa, Iowa City 52242.

Epilepsia
|January 1, 1988
PubMed
Summary
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Phenytoin (PHT) significantly reduces serum folate levels. Supplementing with folic acid (FA) during PHT treatment may help mitigate these effects, though further research is needed.

Area of Science:

  • Pharmacology
  • Biochemistry
  • Clinical Nutrition

Background:

  • Phenytoin (PHT) is an anticonvulsant medication.
  • Drug-induced nutrient deficiencies are a concern in long-term therapy.
  • The interaction between PHT and folate metabolism requires further elucidation.

Purpose of the Study:

  • To investigate the impact of PHT on serum folate levels.
  • To assess the efficacy of oral folic acid (FA) supplementation in counteracting PHT-induced folate depletion.
  • To determine PHT dosage requirements for maintaining specific serum concentrations.

Main Methods:

  • A two-phase study involving 13 healthy male subjects (20-35 years).
  • Phase I: Determined PHT's Vmax and Km to establish therapeutic doses.

Related Experiment Videos

  • Phase II: A four-way crossover study examining the effects of 1 mg and 5 mg FA on serum folate during PHT administration at varying concentrations (Km-1 and Km+5).

    • Main Results:

    • Phenytoin administration led to a significant mean decrease of 42.15% in serum folate levels.
    • During Phase II, serum folate decreased by 12.80% and 23.24% before FA supplementation at Km-1 and Km+5 PHT concentrations, respectively.
    • These findings indicate a dose-dependent effect of PHT on folate levels.

    Conclusions:

    • Phenytoin therapy is associated with a substantial reduction in serum folate.
    • Oral folic acid supplementation shows potential in mitigating PHT-induced folate deficiency.
    • Further investigation into optimal FA dosage and long-term effects is warranted.