Dilantin (phenytoin sodium) is a brand-name drug prescribed to treat or prevent certain types of seizures in adults and some children. The medication is available in these forms: extended-release oral capsule, chewable tablet, and liquid suspension.

As with all medications, the cost of Dilantin can vary. Factors that may affect the price you’ll pay include:

  • your treatment plan
  • your insurance coverage
  • the pharmacy you use
  • whether Dilantin has a savings program (see the “Financial and insurance assistance” section below)

To find out what the cost of Dilantin will be for you, talk with your doctor, pharmacist, or insurance provider. Or look below in the next section to learn how much you can save by using an Optum Perks coupon.

To save money on your Dilantin prescription, explore these Optum Perks coupons.

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Retail price refers to the manufacturer’s published list price and is up to date as of 3/2023. Retail and discounted prices are U.S.-only and can vary based on region and pharmacy. We cannot guarantee that the discounted price listed here will exactly match the price at your pharmacy. Please contact your pharmacy for the exact price.

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Pricing source:Perks.optum.com


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The active ingredient in Dilantin is phenytoin sodium. It’s available as the generic drug phenytoin. A generic drug is considered to be as safe and effective as the original drug. And generics tend to cost less than brand-name drugs.

If your doctor has prescribed Dilantin and you’re interested in using phenytoin instead, talk with your doctor. They may have a preference for one version or the other. You’ll also need to check with your insurance provider, as it may cover only one or the other.

To find out the phenytoin cost and how it compares with the cost of Dilantin, talk with your doctor, pharmacist, or insurance provider.


Brand-name drugs can be expensive because of the research needed to test their safety and effectiveness. The manufacturer of a brand-name drug can sell it for up to 20 years. When the brand-name drug’s patent expires, multiple manufacturers can create generic versions. This marketplace competition may lead to lower costs for generics. Also, because generics contain the same active ingredients as brand-name drugs, they don’t require the same costly testing.

If you take Dilantin long term, you may be able to lower its cost in the following ways.

Getting a 3-month supply

You may be able to get a 90-day supply of Dilantin. If approved by your insurance company, getting a 90-day supply of the drug could reduce your number of trips to the pharmacy and help lower the cost. If you’re interested in this option, check with your doctor, pharmacist, or insurance provider.

Using a mail-order pharmacy

Dilantin may be available through a mail-order pharmacy. Using this type of service may help lower the drug’s cost and allow you to receive your medication without leaving home. Some Medicare plans may help cover the cost of mail-order medications. You may also be able to get a 90-day supply of the drug via mail order.

If you don’t have health insurance, talk with your doctor or pharmacist. They may be able to suggest online pharmacy options that could work for you.

If you need financial support to pay for Dilantin, or if you need help understanding your insurance coverage, help is available. For example:

  • A Dilantin patient assistance program in the form of a savings card is available for Dilantin. For more information and to find out if you’re eligible for support, call 866-590-9400 or visit the program website.
  • Some websites provide details about drug assistance programs, ways to make the most of your insurance coverage, and links to savings cards and other services. Two such websites are:

To learn more about saving money on prescriptions with or without insurance, check out this article.

Here are answers to some frequently asked questions about drug cost and Dilantin.

Why is Dilantin so expensive?

Dilantin is a brand-name drug. Typically, brand-name drugs are more expensive than generics.

Additionally, Dilantin comes in three forms: an oral capsule, a chewable tablet, and a liquid suspension (a type of liquid mixture). The form you take may also affect the cost of the drug.

To find out more about Dilantin cost, see the above section, “Dilantin coupons and savings.”

How much does Dilantin cost without insurance?

What you pay for Dilantin if you have insurance compared with what you’d pay without it depends on several factors.

Factors that could affect what you pay for this drug without insurance include:

  • the quantity you’re prescribed (such as a 90-day or 30-day supply)
  • whether you apply and qualify for any available savings programs, also sometimes called patient assistance programs
  • your dosage and treatment plan

These same factors may affect your price for Dilantin if you have insurance. But the price you pay with insurance will also depend on:

  • your specific plan benefits
  • any prior authorization requirements you have for drug coverage

To learn more about what you’d pay for Dilantin with or without insurance, talk with your doctor, pharmacist, or insurance provider (if you have one).

You can also visit Optum Perks* for price estimates for this drug when using coupons from their site. However, Optum Perks coupons cannot be used with insurance benefits or copays.

* Optum Perks is a sister site of Medical News Today.

What is the Dilantin 100-mg price compared to the phenytoin-100 mg price?

The cost you will pay for a Dilantin 100-mg dosage compared with a phenytoin 100-mg dosage depends on various factors.

First, Dilantin is a brand-name drug. The active ingredient of Dilantin is phenytoin sodium. It’s available as the generic drug phenytoin. A generic drug is considered to be as safe and effective as the original drug. And generics tend to cost less than brand-name drugs.

The form of the drug may also affect its price. Dilantin is available as an oral capsule, a chewable tablet, and a liquid suspension. Phenytoin is available as a chewable tablet and as an oral solution. The brand-name versions may cost more than the generic phenytoin.

Additional factors can affect your prescription cost, including:

  • the length of your treatment
  • whether there are payment assistance programs for your prescribed treatment
  • whether you’re paying out of pocket or have insurance

To learn more about the cost of Dilantin compared with phenytoin, talk with your doctor, pharmacist, or insurance provider.

Below is information you may want to consider if you have insurance and receive Dilantin.

If you have insurance, your insurance company may require prior authorization before it covers Dilantin. This means the company and your doctor will discuss Dilantin in regard to your treatment. The insurance company will then determine whether the medication is covered.

If a drug requires prior authorization but you start treatment without the prior approval, you could pay the full cost of the medication. You can ask your insurance company whether Dilantin requires prior authorization.

Disclaimer: Medical News Today has made every effort to make certain that all information is factually correct, comprehensive, and up to date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or another healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.