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COVID-19 and severe cutaneous allergic reactions to sulfonamides.

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From the Section of Allergy, Asthma and Immunology, Department of Medicine, Pennsylvania State College of Medicine, Hershey, Pennsylvania and.

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Phenytoin is a well-known anticonvulsant medication that is useful in the management of most seizure disorders. Given the narrow therapeutic index of 10-20 mg/mL, acute phenytoin overdose can occur with either oral or intravenous administration. There is no distinct antidote to phenytoin, and therefore supportive care is the treatment of choice.

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