Dilantin is an externally administered medicine. Its formulation contains phenytoin as its primary ingredient. This primary ingredient is an anti-convulsing drug, i.e., an anti-seizure medication.
It is used for the prevention and treatment of certain seizures. It is important to note that it does not cure any of them; it helps in controlling your condition and is used with a combination of other drugs.
It may also be used for other purposes not mentioned in this guide.