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Oral and intramuscular phenytoin
Clinical Pharmacology and Therapeutics
|March 1, 1976
Summary
This study found that adjusting phenytoin dosage for epileptic patients transitioning between oral and intramuscular (IM) routes maintained seizure control. Stable plasma levels were observed, with IM administration suitable for short-term use.
Area of Science:
- Pharmacology
- Neurology
- Clinical Pharmacy
Background:
- Phenytoin is a key antiepileptic drug.
- Managing therapeutic drug levels during route changes is crucial for seizure control.
- Oral phenytoin dosage adjustments require careful consideration.
Purpose of the Study:
- To evaluate plasma phenytoin levels and seizure control in epileptic patients during a regimen switch.
- To assess the safety and efficacy of intramuscular (IM) phenytoin administration.
- To determine the suitability of a specific dosage adjustment strategy for short-term IM therapy.
Main Methods:
- Twelve epileptic patients on established oral phenytoin doses were studied.
- A 1-week intramuscular (IM) phase with a 50% increased dose followed oral administration.
- A subsequent 1-week oral phase used a halved original dose, with plasma levels and seizure control monitored.
Main Results:
- Plasma phenytoin levels remained stable without sharp decreases or dangerous increases across phases.
- Patients receiving once-daily dosing exhibited remarkably stable levels.
- Seizure control was consistently maintained throughout all study phases.
- Local irritation at the injection site was the only reported adverse experience.
Conclusions:
- The evaluated dosage regimen is suitable for short-term intramuscular phenytoin therapy in patients accustomed to oral administration.
- This strategy effectively maintains therapeutic drug levels and seizure control.
- Intramuscular phenytoin can be a viable option for temporary treatment adjustments.