TOPAMAX 100 MG TABLET

What it is

TOPAMAX 100 MG TABLET is how the CMS NADAC file names this product. The FDA NDC Directory lists it as topiramate, under the trade name “Topamax”.

FDA gives its dosage form as tablet, coated and its route as oral.

The labeler, the company named on the label, is Janssen Pharmaceuticals, Inc.

FDA lists no Established Pharmacologic Class for it.

The NADAC file of 2026-10-14 prices it under one NDC (National Drug Code), 50458-0641-65.

NADAC classes it as a brand-name drug (rate-setting class B), and does not mark it as sold over the counter.

What pharmacies pay

Pharmacies pay $537.33 for 30 tablets (30 × $17.91087 per EA, rounded to the cent), by the CMS NADAC file of 2026-10-14; that price took effect on 2026-09-23. That is what pharmacies pay their suppliers, not what they charge you.

NADAC’s explanation code for it: 1, calculated from the most recently completed pharmacy survey.

NADAC also lists, on the row of one brand NDC, what pharmacies pay for the generic equivalent, a different product: $0.05669 per EA filed.

CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17

What NADAC measures · Why 30 tablets · NADAC explanation codes

The NDC

• 50458-0641-65 · Janssen Pharmaceuticals, Inc. · $17.91087 per EA · eff. 2026-09-23 filed

Other strengths, forms and brands

26 other products in the NADAC file share the FDA nonproprietary name topiramate with TOPAMAX 100 MG TABLET. The 23 below share a strength or dosage form with it first; search OpenBill for the rest.

Part D is one average per brand and generic name, over every strength and form.

CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-01-01, 2026-07-01, 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17

Medicare Part D · DSD_PTD_RY26_P04_V10_DY24_BGM.csv · eff. 2024-01-01 to 2024-12-31 · as of 2026-06-25 · retrieved 2026-10-18

What Medicare paid

Medicare Part D paid $479.76 for 30 tablets, at an average of $15.99196 per EA in 2024 (2024-01-01 to 2024-12-31) for “Topamax” and “Topiramate”, every strength and form sold under that name together (Medicare Part D Spending by Drug, file of 2026-06-25).

That average covers 21,528 Part D claims (fills, including refills) for 2024-01-01 to 2024-12-31, across every maker, strength and form under the name.

Medicare's price is not your price.

What Part D spending measures · Which Medicare figure OpenBill compares · How the spread is worked out

What to ask at the counter

None of these figures is your price: what you pay depends on your pharmacy, your insurance, coupons and discounts.

• What is your cash price for 30 tablets? Is it lower than what I would pay through my insurance?
• Is a generic version available, and would it suit me? NADAC lists a generic with the same ingredient, strength and dosage form by FDA: TOPIRAMATE 100 MG TABLET. Ask your pharmacist or prescriber; do not switch on your own.
• If you have Medicare Part D: what is my plan’s copay or coinsurance for it? The Part D average on this page is not what you pay.
• These are questions about price, not medical advice. Do not change or stop a medicine without talking to your prescriber or pharmacist.