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Related Experiment Videos

How high can we go with phenytoin?

Eran Kozer1, Shahid Parvez, Berge A Minassian

  • 1Division of Clinical Pharmacology and Toxicology, Department of Pediatric Laboratory Medicine, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario, Canada M5G 1X8. eran.kozer@sickkids.on.ca

Therapeutic Drug Monitoring
|May 22, 2002
PubMed
Summary

For effective seizure control, some patients may require higher than usual phenytoin levels. Individualized monitoring is key, balancing therapeutic benefits against potential toxicity.

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Area of Science:

  • Pharmacology
  • Neurology
  • Clinical Therapeutics

Background:

  • Phenytoin is a widely used anticonvulsant medication.
  • High serum phenytoin concentrations are typically associated with toxicity.
  • The standard therapeutic range for serum phenytoin is up to 80 micromol/L.

Observation:

  • A 9-year-old female patient experienced recurrent episodes of decreased consciousness.
  • This patient required serum phenytoin concentrations twice the standard upper limit for seizure control.
  • Despite high levels, the patient exhibited minimal toxicity, primarily nystagmus.

Findings:

  • Individualized phenytoin dosing is crucial for optimal seizure management.
  • Some patients may need supratherapeutic serum phenytoin concentrations to achieve therapeutic efficacy.

Related Experiment Videos

  • Therapeutic drug monitoring should prioritize clinical response over arbitrary numerical targets.

    • Implications:

    • Clinicians must tailor phenytoin therapy to individual patient needs.
    • Careful assessment of the risk-benefit ratio is essential when managing high phenytoin levels.
    • This case underscores the importance of personalized medicine in epilepsy treatment.