How to Save Money on Dilantin in 2026: Coupons, Discounts, and Patient Assistance

Dilantin (phenytoin) can range from very affordable (as a generic) to surprisingly expensive (as the brand-name product). Understanding your options — including GoodRx coupons, the manufacturer's savings card, and patient assistance programs — can make a significant difference in what you pay every month.

Brand Dilantin vs. Generic Phenytoin: What's the Price Difference?

The price gap between brand and generic is substantial:

Brand Dilantin (100 mg, 90 capsules): Average retail price approximately $200–$210 at most pharmacies.

Brand Dilantin with GoodRx: As low as $63 for a 30-day supply, representing a 69% discount off the retail price.

Generic phenytoin (retail): Average retail approximately $46 for a 30-day supply (90 capsules of 100 mg).

Generic phenytoin with GoodRx or SingleCare: As low as $13–$20 for a 30-day supply, depending on the pharmacy and coupon.

For most patients, generic phenytoin is clinically equivalent to brand Dilantin for maintenance therapy, though switching requires caution (see the narrow therapeutic index discussion below). If your doctor has cleared you to take generic phenytoin, the savings are significant.

Using GoodRx to Save on Dilantin or Phenytoin

GoodRx is a free discount program you can use at thousands of pharmacies regardless of your insurance status. To use it:

Go to GoodRx.com or the GoodRx app and search for "phenytoin" or "Dilantin"

Select your dosage, quantity, and enter your zip code

Compare prices across nearby pharmacies and choose the best price

Show or print the GoodRx coupon at the pharmacy counter when picking up your prescription

Note: You cannot use GoodRx simultaneously with insurance. Compare your insurance copay against the GoodRx price — whichever is lower is the one to use. For generic phenytoin, GoodRx prices are often lower than insurance copays.

The Dilantin Manufacturer Savings Card (Viatris)

Viatris, the manufacturer of brand Dilantin, offers a savings card for eligible patients:

Program name: Dilantin Savings Card

Savings: Up to $20 per 30-day supply, with a maximum savings of $240 per calendar year

Insurance required: Yes — the savings card is designed for insured patients with a copay. It is not for cash-pay patients.

How to enroll: Register online at dilantin.com/en/Savings or call 1-866-590-9400

Eligibility: US residents age 18 or older; not valid for patients with Medicaid, Medicare, or other government programs

Patient Assistance Programs for Uninsured Patients

If you are uninsured or underinsured and cannot afford Dilantin or generic phenytoin, several programs may help:

Viatris Patient Assistance: Viatris has patient assistance programs for low-income, uninsured patients. Contact them at 1-833-944-5687 for the Dilantin Cash Option Program.

NeedyMeds.org: A nonprofit database of patient assistance programs for hundreds of medications, including phenytoin

RxAssist.org: Another resource for finding manufacturer-sponsored patient assistance programs

SingleCare: Offers coupons reducing generic phenytoin to approximately $19.35 for 90 capsules at major pharmacy chains like Kroger, Walgreens, and Fry's

Insurance Coverage for Phenytoin

Generic phenytoin is a Tier 1 drug on most insurance formularies — meaning it has the lowest copay tier. Most Medicare Part D and commercial plans cover it. Brand Dilantin is on a higher tier and will carry a higher copay. If your plan covers generic phenytoin, your copay could be as low as $0–$10 per fill.

Always check your specific plan's formulary at open enrollment. Ask your pharmacist to run both your insurance price and the GoodRx price at pickup — take whichever is lower.

One Caution: Switching to Generic to Save Money

Phenytoin's narrow therapeutic index means switching from brand to generic — or between generic manufacturers — can affect your blood levels. Before switching to save money, talk to your neurologist. They may recommend a blood level check after any change. For more background, see Why Is Dilantin So Hard to Find? for details on the NTI issue.

If cost is a concern alongside availability issues, medfinder can help you find a pharmacy that has your medication in stock — and once you've found it, comparing coupon prices is a smart next step.