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Diamox Cost, Generic and Savings
- Lowest U.S. online pharmacy price
- $0.34 per capsule$66.20 for 90 days (180 capsules), shipping included · FDA-approved generic acetazolamide 500 mg · ships within the U.S.
- Lowest international online pharmacy price
- Not available
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Quick answerThe FDA lists brand Diamox as discontinued in the U.S. FDA-approved generic capsules are sold here, listed at about $69 for 100.
Name check: Diamox came as 125 and 250 mg tablets and as Diamox Sequels 500 mg extended-release capsules. This page prices the 500 mg capsules; the tablets are a different product.
Compare Diamox prices from licensed online pharmacies
| Pharmacy | Medication | Price | Shipping & delivery | Total (90 days) | Buy |
|---|---|---|---|---|---|
| Lowest per capsuleLicensed U.S. pharmacy A | Acetazolamide ER 500mg Capsules500 mg · genericU.S. pharmacy; maker not listed on its price pageShips from United StatesShips within the U.S. (no customs) · checked Nov 11, 2026 | $61.20for 180 capsules$0.34 per capsule | $5Pharmacy's estimate: 2–8 business days | $66.20 for 90 days= $66.20 for 90 daysincl. $5 shippingChecked Nov 11 | See pharmacy (members) Members see the pharmacy |
| Lowest per capsuleLicensed U.S. pharmacy B | Acetazolamide (Diamox Sequels)500 mg · genericU.S. pharmacy; maker not listed on its price pageShips from United StatesShips within the U.S. (no customs) · checked Nov 11, 2026 | $69for 180 capsules$0.38 per capsule | FreePharmacy's estimate: 7–10 business days | $69 for 90 days= $69 for 90 daysincl. $0 shippingChecked Nov 11 | See pharmacy (members) Members see the pharmacy |
| Lowest per capsuleLicensed U.S. pharmacy C | Acetazolamide Extended Release 500mg Capsule500 mg · genericU.S. pharmacy; maker not listed on its price pageShips from United StatesShips within the U.S. (no customs) · checked Nov 11, 2026 | $91.39for 180 capsules$0.51 per capsule | FreePharmacy's estimate: 3–5 business days | $91.39 for 90 days= $91.39 for 90 daysincl. $0 shippingChecked Nov 11 | See pharmacy (members) Members see the pharmacy |
No prices match those filters.
Buying from a pharmacy outside the U.S.? Read Is it safe to order Diamox from Canada?
90-day cost = 180 capsules at the usual dose of 2 a day, bought as one order of whole packs with one shipping fee. 90-day cost is worked out from each pharmacy's real order size so different pack sizes compare fairly. Orders are kept within a 3-month supply (92 days); a pack that is larger than that is marked and not used for the lowest price at the top of this page. Prices checked Nov 11, 2026 on each pharmacy's website, in U.S. dollars. Savings compare with the U.S. list price. The lowest price at the top of this page uses only packs whose maker the pharmacy names, or whose product country and ships-from country it states. Price is the pharmacy's own price for one pack, as shown on its website (converted to U.S. dollars when it prices in Canadian dollars). Delivery is the pharmacy's own estimate for the shipping option shown, not a promise; some pharmacies count from when they receive your prescription or ship the order. Total = the packs needed + shipping. When those packs don't add up to exactly 90 days, the row shows what that order costs and, under it, what it works out to for 90 days; we sort by the 90-day amount so pack sizes compare fairly. Prices change often; confirm at checkout. U.S. rows: the cash price a U.S. pharmacy published on its own website on the date shown, for whole fills, plus its standard shipping; no insurance or discount cards.
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Jump to: U.S. cost · Medicare · Maker savings · Generic Diamox · Similar drugs · Uses · FAQ
Diamox Sequels (acetazolamide) 500 mg extended-release capsules. The brand is discontinued in the U.S., and FDA-approved generic capsules are sold here.
Diamox cost at a glance
- Brand Diamox is discontinued in the U.S. The FDA's Drugs@FDA database lists Teva's Diamox Sequels 500 mg capsules and Diamox tablets as discontinued. The FDA has determined they were not taken off the market for safety or effectiveness reasons (Drugs@FDA, checked 2026-11-11).
- Generic Diamox Sequels is sold in the U.S. The FDA has approved generic acetazolamide extended-release 500 mg capsules from eight companies, rated equivalent to Diamox Sequels (FDA Orange Book). In the Texas 2026 drug price filing, a bottle of 100 capsules lists at $68.74 (Avet), $68.75 (Zydus) or $75.00 (Micro Labs) (Texas DSHS).
- U.S. list price for the brand: there isn't one. Brand Diamox is discontinued in the U.S. U.S. list prices for the generic are shown above.
- How we count: 2 capsules a day, the label's glaucoma dose (one 500 mg capsule twice a day), so 180 capsules for 90 days. For altitude sickness, people take it for a much shorter time.
- With Medicare: your cost depends on your Part D plan. In 2026, deductibles are capped at $615 and yearly out-of-pocket costs for covered drugs at $2,100 (Medicare.gov).
How much does Diamox cost in the U.S.?
| If you have | What Diamox costs | Source |
|---|---|---|
| No insurance (brand list price) | None. The FDA lists brand Diamox as discontinued in the U.S. FDA-approved generic acetazolamide is sold here; see the next row. | Drugs@FDA |
| No insurance (generic acetazolamide ER) | FDA-approved generic acetazolamide ER 500 mg capsules are sold in the U.S. The Texas 2026 filing lists 100 capsules at $68.74 (Avet) to $75.00 (Micro Labs) list price, depending on the maker. Ask your pharmacist for the cash price. | Texas DSHS 2026 WAC report |
| Private or employer insurance | Your copay depends on your plan's drug list. Ask your plan whether it covers generic acetazolamide ER capsules. | FDA Orange Book |
| Medicare Part D | Your cost depends on your plan. In 2026, deductibles are capped at $615 and yearly out-of-pocket costs for covered drugs at $2,100. | Medicare.gov |
| Medicaid | Your state Medicaid program sets any copay. Ask your pharmacist or state Medicaid office. | Medicaid.gov |
The FDA lists brand Diamox as discontinued in the U.S. (Drugs@FDA), so this page shows no U.S. list price for the brand. FDA-approved generic acetazolamide ER 500 mg capsules are sold by several U.S. makers. In the Texas 2026 drug price filing, a bottle of 100 capsules lists at $68.74 to $75.00, depending on the maker (Texas DSHS). That's about 69 to 75 cents a capsule. List price is the maker's wholesale price before discounts, so pharmacies may charge more.
Diamox cost with Medicare in 2026
In 2026, Part D plans can charge a deductible of up to $615, and once your out-of-pocket spending on covered Part D drugs reaches $2,100, you pay nothing more for covered drugs for the rest of the year. What you pay for generic acetazolamide depends on your plan's drug list.
| Medicare Part D | What Diamox costs | Source |
|---|---|---|
| Part D deductible | No Medicare drug plan may have a deductible above $615 in 2026. Some plans have none. | Medicare.gov |
| Yearly out-of-pocket cap | Once your out-of-pocket spending on covered Part D drugs reaches $2,100 in 2026, you pay nothing more for covered drugs that year. | Medicare.gov |
Savings programs from the maker
We show the programs that usually fit, cheapest first where we know the price. Private insurance means a plan through work or one you buy yourself. Programs set their own rules, so check the terms before you count on one. We don't save this choice.
Checking more than one medicine? Use the free Medicare Drug Cost Check.
eDrugSearch doesn't run its own savings program for Diamox. Brand Diamox is discontinued in the U.S. These programs can help with the cost of the generic:
- Medicare Extra Help: if you have Medicare and limited income, Extra Help lowers what you pay for prescriptions. (Social Security)
- Medicare Prescription Payment Plan: a free Medicare option that spreads your drug costs into monthly payments across the year. It doesn't lower the total, but it can make costs easier to manage. (Medicare.gov)
Is there a generic Diamox?
Yes. The FDA has approved generic acetazolamide extended-release 500 mg capsules from eight companies, including Avet (Heritage), Zydus, Accord, Alembic, Micro Labs and Novast (sold by Ingenus), all rated equivalent to Diamox Sequels. The first was approved on December 10, 2008. The FDA lists brand Diamox as discontinued in the U.S.
| Strength | U.S. generic | Makers | Since |
|---|---|---|---|
| 500 mg | Yes | Avet (Heritage), Zydus, Accord, Alembic, Micro Labs, Novast (Ingenus) and others | — |
Outside the U.S.: Online pharmacies abroad may also sell acetazolamide made for other markets. Those packs are not FDA-approved, and the price table labels them that way.
Source: FDA Orange Book: acetazolamide products. As of Nov 11, 2026.
Compare Diamox with similar drugs
Other glaucoma medicines on eDrugSearch. Lumigan and Rhopressa are eye drops, so they work in a different way from acetazolamide capsules. Prices are for each drug's lowest-priced strength.
| Drug | Type | Lowest price we found | Link |
|---|---|---|---|
| Lumiganbimatoprost | Glaucoma eye drop (prostaglandin analog) | From $3.39 per mL | See prices |
| Rhopressanetarsudil | Glaucoma eye drop (rho kinase inhibitor) | Checking prices | See prices |
Lowest price per unit, before shipping, from licensed pharmacies shipping to the U.S., any strength. Only your doctor can decide whether another drug is right for you.
What is Diamox used for?
Diamox (acetazolamide) is a carbonic anhydrase inhibitor. It lowers pressure inside the eye, and it helps the body adjust to high altitude. According to the FDA label for acetazolamide extended-release capsules (DailyMed), it is used:
- With other treatments, for chronic open-angle glaucoma and secondary glaucoma.
- Before surgery for acute angle-closure glaucoma, to lower eye pressure when the operation has to wait.
- To prevent or ease the symptoms of acute mountain sickness (altitude sickness).
The extended-release capsules come in one strength, 500 mg. For glaucoma, the label's dose is one capsule twice a day. For altitude sickness, it's 500 to 1,000 mg a day in divided doses, started 24 to 48 hours before the climb. Acetazolamide is a sulfonamide (sulfa-type) medicine, and the label warns of rare but serious reactions. It must not be used by people with low sodium or potassium levels or marked kidney or liver disease. Your prescriber decides which medicine is right for you.
Is it safe to order Diamox from Canada?
Many Americans do, but U.S. law and customs rules apply, and for Diamox, compare the U.S. price of FDA-approved generic acetazolamide before you order. Federal law generally doesn't allow individuals to import prescription drugs, though under its personal importation policy the FDA has long used enforcement discretion for some personal-use shipments, generally no more than a three-month supply (FDA). Congress has said enforcement against individuals should focus on imports that pose a significant threat to public health (Federal Food, Drug, and Cosmetic Act section 804(j)(1), 21 U.S.C. 384(j)(1)). You need a prescription from your doctor. New U.S. Customs rules for mailed orders start January 20, 2027. In Canada, Health Canada lists every Diamox product, including Diamox Sequels, as cancelled (Health Canada), so Canadian pharmacies sell generic acetazolamide instead.
Read our guide to buying prescription drugs from Canada and what the 2027 customs rules mean. Compare licensed Canadian pharmacies.
Frequently asked questions
How much does Diamox cost without insurance?
Brand Diamox is discontinued in the U.S., so there's no current U.S. list price for it. FDA-approved generic acetazolamide ER 500 mg capsules are sold here: the Texas 2026 drug price filing lists 100 capsules at $68.74 to $75.00, depending on the maker. Ask your pharmacist for the cash price.
Is there a generic for Diamox?
Yes. The generic name is acetazolamide. The FDA has approved generic extended-release 500 mg capsules from eight companies, rated equivalent to Diamox Sequels, and generic tablets are sold too. Ask your pharmacist whether a generic can fill your prescription.
Is Diamox discontinued?
Yes, in the U.S. The FDA's Drugs@FDA database lists Teva's Diamox Sequels capsules and Diamox tablets as discontinued, and says they were not withdrawn for safety or effectiveness reasons. Generic acetazolamide is still sold. Health Canada also lists every Diamox product as cancelled.
What is Diamox Sequels?
Diamox Sequels was the brand name for acetazolamide 500 mg extended-release capsules. "Extended-release" means the capsule lets the medicine out slowly, so it's taken twice a day. Today the same product is sold in the U.S. as generic acetazolamide extended-release capsules.
Are there savings programs for Diamox?
Brand Diamox is discontinued in the U.S. FDA-approved generic acetazolamide is sold here; ask your pharmacist for its cash price. If you have Medicare and limited income, Extra Help can lower what you pay for prescriptions.
How much does Diamox cost with Medicare?
It depends on your Part D plan. In 2026, Part D deductibles are capped at $615 and out-of-pocket costs for covered drugs at $2,100 a year. People with limited income can apply for Extra Help.
Are acetazolamide tablets the same as Diamox Sequels?
No. Both contain acetazolamide, but the 125 mg and 250 mg tablets release the medicine right away, while the 500 mg capsules release it slowly. The FDA label gives them different dosing schedules. This page prices the 500 mg extended-release capsules only.
Sources
- Drugs@FDA: Diamox Sequels capsules (NDA 012945) (500 mg extended-release capsule, Teva: Discontinued; not withdrawn for safety or effectiveness reasons; checked 2026-11-11)
- Drugs@FDA: Diamox tablets (NDA 008943) (125 and 250 mg tablets: Discontinued; checked 2026-11-11)
- FDA Orange Book: acetazolamide products (8 approved generic 500 mg extended-release capsules, TE code AB)
- Drugs@FDA data: first generic acetazolamide ER capsule (ANDA 040904) (approved December 10, 2008)
- FDA NDC Directory: Ingenus acetazolamide ER 500 mg (NDC 50742-233) (ANDA 203434 (Novast), marketing start July 31, 2017)
- Acetazolamide extended-release capsules prescribing information (DailyMed) (Zydus, ANDA 205301, label dated October 2024)
- Texas DSHS: 2026 annual WAC report (acetazolamide ER 500 mg, 100 capsules: Avet $68.74 (NDC 23155-787-01), Zydus $68.75 (NDC 70710-1591-01), Micro Labs $75.00 (NDC 42571-243-01))
- Health Canada Drug Product Database: Diamox (all 6 Diamox entries Cancelled Post Market (Diamox Sequels DIN 02238073 cancelled 2006-03-22); checked 2026-11-11)
- Medicaid.gov: cost sharing
- Social Security: Medicare Extra Help
- Medicare Prescription Payment Plan
- Medicare.gov: Part D drug costs (deductible up to $615 and $2,100 out-of-pocket threshold in 2026)
- FDA: personal importation
eDrugSearch does not sell medication, and this is not medical advice. Prices change often; confirm the price at checkout. Talk with your doctor or pharmacist before changing how you get your medication.