Final answer:
The correct medication for treating seizures in the provided list is Phenytoin, which is an antiepileptic drug.
Step-by-step explanation:
The medication used to treat seizures from the list provided is Phenytoin. Phenytoin is an antiepileptic drug used to control seizures. Out of the options listed:
1) Digoxin is used for heart conditions.
2) Heparin is used as an anticoagulant to prevent blood clots.
3) Captopril is used to treat high blood pressure and heart failure.
4) Phenytoin is indeed the correct choice for epilepsy and seizure disorders.