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Phenytoin-induced hypersensitivity reactions.

T R Prosser1, R D Lander

  • 1Department of Pharmacy, St. Mary Medical Center, Hobart, IN.

Clinical Pharmacy
|September 1, 1987
PubMed
Summary

A rare case of phenytoin-induced hepatitis mimicking mononucleosis highlights severe hypersensitivity reactions. Prompt recognition of symptoms like fever, rash, and lymphadenopathy is crucial for managing phenytoin toxicity.

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Area of Science:

  • Neurology
  • Hepatology
  • Immunology

Background:

  • Phenytoin is a widely used anticonvulsant for seizure disorders.
  • Hypersensitivity reactions to phenytoin can manifest in various ways, including dermatologic, lymphoid, and hepatic syndromes.
  • Early identification of these reactions is vital for patient management.

Observation:

  • A 23-year-old woman with a seizure disorder developed symptoms including fever, rash, lymphadenopathy, and hepatomegaly while on phenytoin.
  • Despite discontinuing phenytoin, her condition worsened after intravenous administration, progressing to hepatotoxicity and coma.
  • She eventually recovered with supportive care and was discharged on alternative anticonvulsant therapy.

Findings:

  • This case illustrates phenytoin-induced hepatitis presenting with mononucleosis-like symptoms.
  • Serious phenytoin hypersensitivity reactions can lead to significant hepatic injury, encephalopathy, and potentially death.
  • Proposed mechanisms involve immune responses and toxic metabolite production.

Implications:

  • Clinicians should consider phenytoin hypersensitivity in patients presenting with unusual symptoms, especially fever, rash, and lymphadenopathy.
  • Supportive therapy is the mainstay of treatment for phenytoin-induced hypersensitivity.
  • Alternative anticonvulsants like phenobarbital and carbamazepine may be used cautiously.

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