ACETAZOLAMIDE ER 500 MG CAP

What it is

ACETAZOLAMIDE ER 500 MG CAP is how the CMS NADAC file names this product. The FDA NDC Directory lists it as “acetazolamide” and “acetazolamide extended-release”, as its NDCs’ listings variously write the nonproprietary name.

FDA gives its dosage form as “capsule, extended release” and “capsule” and its route as oral.

FDA lists 8 labelers (the companies named on the label) for its NDCs, among them Accord Healthcare Inc., Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc. and Micro Labs Limited.

FDA’s Established Pharmacologic Class for it is Carbonic Anhydrase Inhibitor.

The NADAC file of 2026-10-14 prices it under 11 NDCs (National Drug Codes); the FDA directory lists 8 of them.

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

What pharmacies pay

Pharmacies pay $8.65 for 30 capsules (30 × $0.28822 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.

What NADAC measures · Why 30 capsules · NADAC explanation codes

The 8 labelers

Other strengths, forms and brands

2 other products in the NADAC file share an FDA nonproprietary name with ACETAZOLAMIDE ER 500 MG CAP.

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. 2026-09-23 · 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

Compared with its class

The middle of its 11 NDCs’ NADAC prices is $0.28822 per EA filed.

Of the 4 other products in FDA’s Carbonic Anhydrase Inhibitor class priced per EA, 2 have a higher middle NADAC price and 2 a lower one. The one in the middle is ACETAZOLAMIDE 250 MG TABLET, at $0.13397 per EA filed (eff. 2026-09-23).

Prices are compared per unit, whatever the strength or dose, and a class is not a list of substitutes.

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

How the class comparison works

What Medicare paid

Medicare Part D paid $23.18 for 30 capsules, at an average of $0.77281 per EA in 2024 (2024-01-01 to 2024-12-31) for “Acetazolamide ER” and “Acetazolamide”, every strength and form sold under that name together (Medicare Part D Spending by Drug, file of 2026-06-25).

That average covers 87,073 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 capsules? Is it lower than what I would pay through my insurance?
• 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.