Nervous System Home > Phenytoin Sodium

Phenytoin (Dilantin®) is a drug used to control certain types of seizures in people with epilepsy. It is available by prescription only and works by affecting sodium channels in the brain.
There are several different phenytoin products available, including:
  • Dilantin Kapseals® (phenytoin sodium extended-release capsules)
  • Dilantin Infatabs® (phenytoin chewable tablets)
  • Dilantin-125® (phenytoin oral suspension, or liquid).
Phenytoin products are not interchangeable. The type and dosage your healthcare provider prescribes will be based on your age, current medications, health status, and other factors. In clinical studies, some of the most commonly reported side effects included:
  • Unusual eye movements
  • Muscle coordination problems
  • Slurred speech.
(To learn more about this medication, including safety issues to discuss with your healthcare provider, click Phenytoin.)
Written by/reviewed by:
Last reviewed by: Arthur Schoenstadt, MD
Last updated/reviewed:
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