Phenytoin XR Doesn't Have to Break the Bank

If you take Phenytoin XR to manage your seizures, you already have enough to worry about without stressing over the cost. The good news is that Phenytoin XR is available as an affordable generic, and there are several ways to bring your out-of-pocket costs down even further.

In this guide, we'll break down what Phenytoin XR costs in 2026 — with and without insurance — and walk you through every savings option available, including discount cards, patient assistance programs, and other strategies that can save you real money.

What Does Phenytoin XR Cost Without Insurance?

The cost of Phenytoin XR depends on whether you're filling the generic or a brand-name version:

Generic Phenytoin ER Capsules

• 100 mg (90 capsules): $18 to $45 with a discount coupon
• 200 mg (90 capsules): $25 to $60 with a discount coupon
• 300 mg (30 capsules): $20 to $50 with a discount coupon

Without any discount card or insurance, the cash price for generic Phenytoin ER can range from $30 to $120 for a 30-day supply, depending on your dose and pharmacy.

Brand-Name Options

• Dilantin Kapseals (brand): $80 to $120+ for a 30-day supply
• Phenytek (brand): Starting around $43 with a discount coupon

For most patients, generic Phenytoin ER is the best value. It contains the same active ingredient and meets the FDA's bioequivalence standards. However, because Phenytoin has a narrow therapeutic index, always consult your doctor before switching between brand and generic or between generic manufacturers.

Coupons and Discount Cards

Even if you have insurance, a discount coupon can sometimes beat your copay. Here are the most popular options:

GoodRx

GoodRx shows Phenytoin ER prices starting at about $18 for a 30-day supply at participating pharmacies. You can print a coupon or show it on your phone at the pharmacy counter. No sign-up required.

SingleCare

SingleCare offers comparable savings on generic Phenytoin ER. Prices vary by pharmacy, so it's worth comparing both GoodRx and SingleCare before you fill.

Other Discount Programs

Several other discount card programs may offer savings on Phenytoin XR:

• RxSaver — compare prices across local pharmacies
• Optum Perks — digital coupons accepted at most chains
• BuzzRx — free discount card
• ScriptSave WellRx — accepted at 65,000+ pharmacies
• America's Pharmacy — competitive pricing at independent pharmacies

Pro tip: Prices can vary by $20 or more between pharmacies for the exact same medication. Always compare prices at 2-3 pharmacies before filling.

Patient Assistance Programs

If you're uninsured, underinsured, or facing financial hardship, patient assistance programs (PAPs) can provide Phenytoin at little or no cost.

Viatris Patient Assistance Program

Viatris (the current manufacturer of brand Dilantin) offers a patient assistance program for qualifying patients. Eligibility typically requires:

• No prescription drug insurance coverage
• Income below a specified threshold (typically 200-400% of the federal poverty level)
• U.S. residency

NeedyMeds

NeedyMeds maintains a database of patient assistance programs, including those for phenytoin. They also offer a free drug discount card that can save you up to 80% at the pharmacy.

RxAssist

RxAssist is another comprehensive directory of patient assistance programs. Search for "phenytoin" to find all available programs.

RxHope

RxHope helps connect patients with manufacturer and foundation-based assistance programs.

Other Ways to Save on Phenytoin XR

Ask About 90-Day Supplies

Many insurance plans and pharmacies offer lower per-pill pricing when you fill a 90-day supply instead of 30 days. This can also reduce the number of times you need to find the medication in stock — a double win if availability has been an issue. Read more in our guide to finding Phenytoin XR.

Use Mail-Order Pharmacy

Mail-order pharmacies (through your insurance or through services like Amazon Pharmacy) often offer lower prices and the convenience of home delivery. Since Phenytoin is not a controlled substance, it's eligible for mail-order filling.

Compare Pharmacy Prices

Don't assume your usual pharmacy has the best price. Prices for generic Phenytoin ER can vary significantly:

• Costco: Often among the lowest prices, and you don't need a membership to use the pharmacy
• Walmart: Check their $4/$10 generic program (Phenytoin may qualify depending on formulation)
• Independent pharmacies: May match or beat chain prices, especially with a discount card

Check for Medicare Extra Help

If you're on Medicare and struggling with prescription costs, you may qualify for Medicare Extra Help (Low Income Subsidy), which can reduce your Part D premiums, deductibles, and copays. Visit ssa.gov to check eligibility.

Talk to Your Doctor About Cost

If cost is a barrier, let your doctor know. They may be able to:

• Adjust your dose to use fewer capsules (e.g., one 300 mg capsule instead of three 100 mg capsules)
• Switch you to a more affordable formulation
• Provide samples to bridge a gap
• Refer you to a social worker who can help with assistance programs

What About Brand vs. Generic Savings?

For most patients, generic Phenytoin ER is the clear winner on cost:

• Generic: $18-$45/month with coupon
• Dilantin (brand): $80-$120+/month
• Potential savings: $60-$100+ per month by using generic

That said, Phenytoin's narrow therapeutic index means switching between brand and generic (or between generic manufacturers) should be done carefully. If you've been stable on a specific product, talk to your doctor before making any changes. A small price savings isn't worth it if it affects your seizure control.

For more on the differences, see What Is Phenytoin XR?

Final Thoughts

Phenytoin XR is one of the more affordable seizure medications available, but there are still meaningful savings to be found — especially if you're paying cash or have a high-deductible insurance plan. Start with a discount coupon from GoodRx or SingleCare, explore patient assistance programs if you need more help, and always compare prices across pharmacies.

If you're also having trouble finding Phenytoin XR in stock, use Medfinder to check real-time availability near you. And for the latest on supply issues, read our 2026 shortage update.