Overview
Dilantin is an antiepileptic medicine used to manage and prevent seizures, including generalized tonic-clonic (grand mal) and complex partial (psychomotor, temporal lobe) seizures. It is available as chewable tablets and extended-release capsules for oral use.
What is it used for?
Dilantin is prescribed for:
- Treatment of generalized tonic-clonic (grand mal) seizures.
- Treatment of complex partial seizures (psychomotor, temporal lobe).
- Prevention and treatment of seizures occurring during or following neurosurgery.
It is used in both adults and children, with dosage tailored to the patient's needs and response.
Active ingredients
phenytoin
How it works
Dilantin works by stabilizing nerve activity in the brain. It acts mainly on the motor cortex to inhibit the spread of seizure activity. It likely promotes the outflow of sodium ions from neurons, reducing their hyperexcitability by stabilizing the threshold for firing. This mechanism helps prevent seizures from spreading and reduces seizure frequency.
Available dosage forms
Capsule, Extended Release 5 manufacturers
Tablet, Chewable 4 manufacturers
Medical references
- U.S. National Library of Medicine – DailyMed
- Official prescribing information
- Other authoritative medical references, where applicable
References are used to support the medical information presented on this page.
Medical information disclaimer
The information on WikiDrug is provided for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before making decisions about medication use.
Last updated November 5, 2026