Dilantin Coupon & Prices

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Medically reviewed by  Jamie Winn, PharmD

Is NiceRx a Dilantin coupon provider?

NiceRx does not provide Dilantin coupons, discount cards, or copay cards. We do not offer printable Dilantin manufacturer coupons, Dilantin discounts, rebates, Dilantin savings cards, trial offers, or free samples. We are a service provider that helps eligible individuals access patient assistance programs.

Dilantin patient assistance program

Patient assistance programs are typically sponsored by pharmaceutical companies and provide free or discounted medications to individuals with low income who are uninsured or under-insured and meet the eligibility criteria that vary by program. There are currently no known patient assistance programs for this medication.

How much does Dilantin cost without insurance?

Dilantin prices without insurance will vary by retailer. As a guide, Dilantin oral capsules, extended-release 100 mg will typically cost around $170 for 100 capsules.

How much does Dilantin cost with insurance?

Your individual healthcare plan will determine the copay of Dilantin with insurance. To find out what you will need to pay, contact your pharmacist or insurance provider. They will be able to calculate your copay with your current insurance.

What is Dilantin?

Dilantin is an FDA (U.S. Food and Drug Administration) approved medication manufactured by Pfizer. It is used to treat tonic-clonic and psychomotor seizures (epilepsy) and for the prevention of seizures occurring during or following neurosurgery.

Dilantin is classed as an anti-epileptic drug, sometimes called an anticonvulsant. It prevents seizures by slowing down impulses in your brain. Phenytoin will not treat all types of seizures. Your doctor will decide what the right treatment is for you.

What doses of Dilantin are available?

Dilantin is available as extended-release capsules in the following dose: 30 mg, as chewable Dilantin infatabs in the following dose: 50 mg, as Dilantin Kapseals extended-release capsules, and as an oral suspension in the following dose: 125 mg per 5mL.

Please read the medication guide and always speak with a healthcare professional for medical advice about any changes to your dose so they can monitor and evaluate your condition.

Dilantin active ingredients

Dilantin contains phenytoin sodium as the active ingredient.

Dilantin side effects

The most common side effects of Dilantin in clinical trials include:

  • Drowsiness, confusion
  • Slurred speech
  • Abnormal eye movement
  • Tiredness
  • Headache, dizziness, nausea, vomiting
  • Constipation
  • Trouble sleeping
  • Problems with balance, coordination, or muscle movement

In rare instances, Dilantin can cause more serious side effects. These can include:

  • Irregular heartbeats, chest pain, and feeling light-headed
  • Skin rash
  • Pyrexia, sore throat, swollen glands
  • Red or swollen gums, mouth sores
  • Liver problems – loss of appetite, upper right side stomach pain, dark urine, clay-colored stools, yellowing of the skin or eyes
  • Softening of your bones (osteopenia, osteoporosis, and osteomalacia)
  • Withdrawal may precipitate status epilepticus (seizure)
  • Worsening of depression, suicidal thoughts, or behavior
  • Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)

Your doctor will assess the benefits of using Dilantin against your risk of side effects. Patients are encouraged to report negative side effects or adverse reactions to Dilantin to the FDA. Visit, or call 1-800-FDA-1088.

Dilantin drug interactions

Dilantin can interact with other medications. These include:

  • Antacids such as calcium carbonate, aluminum hydroxide, magnesium hydroxide
  • Sucralfate
  • Amiodarone
  • Azole antifungals such as fluconazole, and itraconazole
  • Macrolide antibiotics such as erythromycin
  • Estrogens
  • Isoniazid
  • Rifamycins such as rifabutin
  • Other anti-seizure medicines such as valproic acid
  • Drugs to treat cancer such as imatinib, irinotecan
  • Corticosteroids such as prednisone
  • Quetiapine
  • Theophylline
  • Hormonal birth control such as pills, patches, or ring
  • Alcohol use can increase your blood levels of phenytoin

This list is not exhaustive and other prescription drugs may interact with Dilantin. Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, such as cimetidine, omeprazole, St. John’s wort, vitamins, and mineral supplements that contain folic acid.

Dilantin contraindications

You should not use Dilantin if you:

  • Have had a serious allergic reaction to the active ingredient phenytoin or to other anti-seizure medications such as carbamazepine, ethosuximide, ethotoin, fosphenytoin, lamotrigine, oxcarbazepine, phenobarbital, or primidone
  • Are allergic to any of the other ingredients in Dilantin or other hydantoins
  • Have liver problems caused by phenytoin
  • Are taking delavirdine
  • Are pregnant or are planning to become pregnant – Dilantin increases the risk of serious birth defects, especially when taken in early pregnancy

Talk to your doctor before using Dilantin if you:

  • Are taking any of the medications that could interact with Dilantin
  • Have heart problems
  • Have diabetes (phenytoin may increase your blood sugar levels)
  • Have liver disease
  • Have depression
  • Have suicidal thoughts or actions
  • Have a vitamin D deficiency
  • Have porphyria (a genetic disorder that affects the skin or nervous system)
  • Are of Asian ancestry (you may need a blood test to determine your risk for having a skin reaction)
  • Are breastfeeding or are planning to breastfeed – Dilantin can pass into breast milk

Dilantin generic

Dilantin is the trademark brand name for phenytoin manufactured by Pfizer. A generic version of phenytoin is available. Generic drugs are generally cheaper than brand-name drugs, but you can still find Dilantin savings through NiceRx.

The content on this website is intended for information purposes only. It does not constitute medical advice. The information on this website should not be relied upon and is not a substitute for professional medical advice. You should always speak to your doctor regarding the risks and benefits of any treatment.