Phenytoin (eg, Dilantin) is an anticonvulsant medication used to treat many seizure disorders. It is also a Vaughan-Williams class IB antiarrhythmic agent, although it is now infrequently used for that … Dilantin (Phenytoin) is used for treating seizures. The medication is also used to prevent seizures after brain surgery. Dilantin is an anti-epileptic drug, also called an anticonvulsant. It works by slowing down impulses in the brain that cause seizures. Dilantin is used to control seizures. Patient Assistance Programs. Pfizer RxPathways ® may be able to help. Pfizer RxPathways connects eligible patients to a range of assistance programs to help them access their Pfizer prescriptions. Learn about Dilantin (Phenytoin) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Dosing during Pregnancy. Decreased serum concentrations of phenytoin may occur during pregnancy because of altered phenytoin pharmacokinetics. Periodic measurement of serum phenytoin concentrations should be performed during pregnancy, and the DILANTIN dosage should be adjusted as necessary. Find the best Dilantin coupon and save up to 80% off both name brand and generic Dilantin. You can also find manufacturer coupon offers and receive a SingleCare pharmacy savings card instantly for an immediate discount at pharmacies such as CVS, Walgreens, Walmart, and more. Phenytoin (PHT), sold under the brand name Dilantin among others, is an anti-seizure medication. It is useful for the prevention of tonic-clonic seizures and partial seizures, but not absence seizures. The intravenous form is used for status epilepticus that does not improve with benzodiazepines. It may also be used for certain heart. Dilantin (phenytoin) is very good at treating and preventing seizures, but it has many drug interactions and some serious side effects. Keppra (levetiracetam) is effective for preventing seizures in people with epilepsy and has fewer drug interactions than its alternatives. Phenytoin is used to prevent and control seizures (also called an anticonvulsant or antiepileptic drug). It works by reducing the spread of seizure activity in the brain.