100mg · 30-count · Neurology · Brand: Dilantin · Generic available
| Pharmacy | Cash Price | Per-30-Day Equiv. |
|---|---|---|
| Costco Cheapest | $22.78 | $22.78 |
| Walmart | $25.79 | $25.79 |
| Kroger | $29.23 | $29.23 |
| Target | $33.53 | $33.53 |
| Rite Aid | $92.42 | $92.42 |
| CVS | $96.71 | $96.71 |
| Walgreens | $103.16 | $103.16 |
The generic form of Phenytoin (Phenytoin Sodium ER) contains the same active ingredient and is bioequivalent to the brand. Ask your pharmacist to dispense the generic — it works the same way, typically at a fraction of the brand-name cost.
Tip: In most states, pharmacists can substitute a generic unless your prescriber writes "dispense as written" (DAW).
Phenytoin (100mg) is sold under the brand name Dilantin and the generic Phenytoin Sodium ER. A standard supply tracked here is 30 units at 100mg.
Pharmacy pricing is not regulated in the United States, so retailers set their own cash prices. Large retailers like Walmart and Costco typically offer lower prices on generics because they use prescriptions as a traffic driver. Chain pharmacies like CVS and Walgreens tend to charge more for the same medication.
Neurology medications often require consistent, uninterrupted dosing, so price-shopping should never come at the cost of a missed refill.
Phenytoin belongs to a class of medications called anticonvulsants, one of the older options used to prevent and control certain types of seizures. It has a narrower margin between an effective dose and a dose that causes side effects than some newer anticonvulsants, which is why patients on phenytoin are often monitored with periodic blood level checks. Switching manufacturers or forms should go through your prescriber and pharmacist together, given how sensitive seizure control can be to small changes in absorption.
Shop around. The cheapest pharmacy tracked here (Costco at $22.78) charges meaningfully less than the most expensive option ($103.16). A quick call can save real money.
Ask for the generic. If your doctor prescribed the brand-name Dilantin, ask your pharmacist whether a generic is available. In most states, pharmacists can substitute a generic unless the prescriber writes "dispense as written."
Use a discount card. Services like GoodRx, SingleCare, and WellRx can sometimes negotiate prices lower than retail cash. The estimated low price for Phenytoin is around $19.82.
Because Phenytoin is a generic medication, manufacturer-sponsored copay savings cards — the kind commonly offered for newer, brand-name drugs — generally aren't available for it. Dilantin's manufacturer typically doesn't offer a savings card once generic competition exists, though it's worth checking their site directly if your prescriber specifically writes for the brand product. For most patients filling the generic, the discount-card and pharmacy membership options described above are the more realistic way to lower cost.
Coverage depends on your specific plan and formulary. Most medications in this category are covered under standard health insurance, typically in Tier 1 or Tier 2. If your copay is higher than the cash price above, it may be cheaper to pay out of pocket — ask your pharmacist to compare. Anticonvulsants used for seizure control are typically covered without prior authorization, though your plan may request that you stay on a consistent manufacturer's generic once stabilized.
Prices shown are estimated retail cash prices modeled from CMS's public NADAC (National Average Drug Acquisition Cost) dataset, cross-referenced against typical major-chain retail markups. Actual prices vary by location and change frequently. RxCostCheck does not collect or sell your health data. Learn more →
How much does Phenytoin cost without insurance?
Without insurance, Phenytoin (100mg) ranges from $22.78 at Costco to $103.16 at Walgreens. With a discount card, the price can be as low as $19.82.
Where is the cheapest place to fill Phenytoin?
Costco typically offers the lowest estimated cash price at $22.78 for 30 100mg.
Is there a generic for Phenytoin?
Yes — the generic Phenytoin Sodium ER is available and bioequivalent to Dilantin. Ask your pharmacist to dispense the generic to save money.
What if my insurance doesn't cover Phenytoin at all?
Ask your prescriber whether a covered therapeutic alternative in the same drug class exists, or ask your pharmacist about a formulary exception or medical-necessity appeal — some plans will cover an otherwise-excluded drug once that documentation is on file. In the meantime, the cash and discount-card pricing shown above is usually the fastest fallback.
Does a 90-day supply of Phenytoin cost less than three 30-day fills?
Often, yes — many pharmacies and insurance plans price a 90-day fill at a lower effective per-dose cost than separate 30-day fills, and some mail-order pharmacy benefits are built specifically around 90-day supplies. Ask your pharmacist or insurer whether a 90-day option is available for this medication before assuming the count shown above is your only choice.
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