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Related Experiment Videos

Single-dose oral phenytoin loading.

H H Osborn, J Zisfein, R Sparano

    Annals of Emergency Medicine
    |April 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    A single oral dose of phenytoin effectively loaded patients with recent seizures, achieving therapeutic serum levels rapidly. This loading method was well-tolerated with minimal toxicity and no breakthrough seizures observed.

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    Area of Science:

    • Pharmacology
    • Neurology
    • Clinical Pharmacy

    Background:

    • Status epilepticus and serial seizures require prompt pharmacologic intervention.
    • Phenytoin is a widely used anti-epileptic drug (AED) for seizure management.
    • Establishing therapeutic phenytoin serum concentrations quickly is crucial for patient outcomes.

    Purpose of the Study:

    • To evaluate the efficacy and tolerability of a single oral 18 mg/kg phenytoin loading dose.
    • To determine the pharmacokinetic profile of oral phenytoin capsules versus suspension.
    • To assess seizure control and adverse events following oral phenytoin loading.

    Main Methods:

    • A single oral dose of 18 mg/kg phenytoin (capsule or suspension) was administered to 44 patients with recent seizures and undetectable baseline serum phenytoin levels.

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  • Serum phenytoin levels were measured at multiple time points post-administration (2, 3-5, 6-10, and 16-24 hours).
  • Patients were observed for seizure activity and adverse events for eight hours post-loading.

    • Main Results:

    • Mean serum phenytoin levels in patients receiving capsules reached therapeutic ranges within hours, peaking at 15.1 micrograms/mL at 16-24 hours.
    • Phenytoin suspension yielded slightly lower, but not statistically significant, serum levels compared to capsules.
    • No seizures recurred during the eight-hour observation period, and drug toxicity was minimal.

    Conclusions:

    • A single 18 mg/kg oral phenytoin loading dose is an effective strategy for rapidly achieving therapeutic serum concentrations in patients with recent seizures.
    • Both oral phenytoin capsules and suspension are well-tolerated and demonstrate a favorable safety profile for initial seizure management.
    • This oral loading regimen offers a viable and convenient alternative for rapid phenytoin administration.