Duzallo Generic: When Will Generic Allopurinol and Lesinurad Be Available?
This page is aggregated from FDA records, court filings and company announcements. Coded and designed by Dr. Brian Staiger, PharmD, BCPS
Updated October 9, 2026 How we build our data
Duzallo Generic at a Glance
Four quick answers from FDA records and our estimate.
- When is the first generic expected? February 2032 About 5.5 years away Why then?
- Has the FDA approved a generic? Not yet None in the FDA’s records yet Why not yet?
- When does the last patent end? February 2032 8 patents listed with the FDA
- Can you buy a generic today? Not yet No company lists one for sale
Generic allopurinol and lesinurad is expected to be available in February 2032, about 5.5 years away. None is for sale yet.
Why February 2032?
It is when Duzallo’s patent 8,546,436 ends. That patent covers the active ingredient, and once it ends, generics can go on sale as soon as the FDA approves them. We rate it probable: more likely than not, but it can still move.
Why hasn’t the FDA approved a generic yet?
That is normal before a launch. The FDA usually can’t give a generic its final approval while a patent or exclusivity still blocks it, so final approval often comes close to the day the generic can be sold. No company holds a “tentative” approval yet either (the FDA’s word for a generic that is ready but still blocked).
Will the generic cost less?
Usually, but no company is recorded as having applied to make one yet, and a single company usually brings only a modest drop. See the price pattern
What should I do now?
Keep taking Duzallo as prescribed. When a generic arrives, your pharmacy may switch you to it automatically, and it may look different. What a generic means for you
Our month is only an estimate based on available information, so we never name a day.
Duzallo by the Numbers
- Reason
- Patent expiresA patent that protects the brand runs out. After that, approved generics can be sold.
- How sure
- Probable More likely than not, but it can still move.
- Price competition
- None filed yet No filers on record
- Brand sales
- Sales not reported
- FDA approved 2017 August 2017 FDA Orange Book
- Patents listed 8 last runs to February 2032 FDA Orange Book
Duzallo’s Road to a Generic
Duzallo has had the market to itself since the FDA approved it in August 2017 (Ironwood Pharmaceuticals Inc). Its 8 listed patents run to February 2032.
The first generic of Duzallo is expected in February 2032.
Why that month: patent 8,546,436, on the active ingredient, ends then.
Each bar runs from the brand’s approval to the day that protection ends. The green band is our projection for the first generic: a month, never a day, because legal dates move and a generic reaches shelves days to weeks after it is allowed. Sources: FDA Orange Book; the expected month from court records and company announcements.
Duzallo Patents and FDA Protections
Every patent and exclusivity the FDA Orange Book lists for Duzallo’s own applications. A protection running past the expected month does not mean the date is wrong: a settlement or a court ruling can let a generic in before a patent ends, and a patent on one formulation or use does not block every generic.
The one that matters for a generic launch: patent 8,546,436, which ends in February 2032, the month the first generic is expected.
| Patent | What it covers | Protects until | Status |
|---|---|---|---|
| 8,283,369 | A way of using it (U-2104) | November 2028 | Active |
| 10,183,012 | A way of using it (U-2104) | November 2028 | Active |
| 8,546,437 | A way of using it (U-2104) | April 2029 | Active |
| 8,084,483 | A way of using it (U-2104) | August 2029 | Active |
| 8,357,713 | The product’s formulation; a way of using it (U-2104) | December 2029 | Active |
| 9,216,179 | A way of using it (U-2104) | August 2031 | Active |
| 9,956,205 | A way of using it (U-2104) | December 2031 | Active |
| 8,546,436 Sets the expected month of generic availability | The active ingredient | February 2032 | Active |
Source: FDA Orange Book, application 209203. Patent numbers open the patent on Google Patents.
Who Is Lined Up to Make Generic Allopurinol and Lesinurad
Three steps stand between a brand and a generic you can buy: a company applies to the FDA, the FDA approves it, and the company starts selling it.
Applied to the FDA
No company is recorded as having applied to the FDA to make a generic Duzallo yet.
Approved by the FDA
Not yet. The FDA has not approved a generic allopurinol and lesinurad. Final approval often comes close to the day a generic can be sold.
For Sale in Pharmacies
Not yet. No company lists a generic allopurinol and lesinurad for sale with the FDA.
Sources: how many companies have applied, from court records and company announcements; approved generics from the FDA Orange Book; tentative approvals from Drugs@FDA; what is for sale from the FDA NDC Directory. The FDA does not disclose an application before it approves it (21 CFR 314.430).
Duzallo Price: What Pharmacies Pay and What Generics Usually Do
What a Generic Could Cost
How we estimate it. The national survey of what pharmacies pay (NADAC) has no recent price for Duzallo, so we cannot show dollars. Here is the FDA’s finding of how far the price pharmacies pay usually falls as generic companies join: about 31% with one company, 44% with two, 73% with four and over 95% with six or more (the typical drop for every drug whose first generic came out from 2015 to 2017).
Median prices pharmacies paid for the generic (invoice prices), compared with the brand’s price before generic entry, from FDA’s 2019 analysis “Generic Competition and Drug Prices”. At the manufacturer’s price FDA found steeper drops (about 39%, 54%, 79% and over 95%), the figures quoted elsewhere on this tracker. A typical pattern, not a price quote for this medicine.
Duzallo Strengths and Forms
| Strength | Form | How it is taken | Approved | Status |
|---|---|---|---|---|
| 200MG;200MG | Tablet | Oral | August 2017 | Discontinued reference product |
| 300MG;200MG | Tablet | Oral | August 2017 | Discontinued reference product |
Source: FDA Orange Book, Ironwood Pharmaceuticals Inc.
What a Generic Duzallo Means for You
Nothing Changes Until It Is in Pharmacies
Until a generic is actually for sale, keep filling Duzallo as usual. When one arrives, there is nothing you need to sign up for.
Your Pharmacy May Switch You Automatically
Every state lets pharmacists fill a brand-name prescription with an FDA-approved generic rated as equivalent to it, and about 19 states require them to, unless your prescriber writes “dispense as written” or “brand medically necessary” on the prescription. Some states ask the pharmacist to tell you, or to get your OK first. A study of every state’s law has the details.
It Will Probably Look Different
US trademark law does not let a generic look exactly like the brand, so the color, shape or markings usually change. The active ingredient, strength and form are the same. An “authorized generic,” made by or for the brand’s own company, can look identical. The FDA explains.
Your Insurance May Change Too
Once a lower-cost version is available, many insurance plans charge more for the brand, or stop covering it. Your plan’s drug list (formulary) says how.
Until a generic is on US pharmacy shelves, be careful with websites that offer “generic Duzallo”. The FDA warns that unlicensed online pharmacies sell counterfeit and unapproved medicines; its BeSafeRx page shows how to check a pharmacy.
Questions people ask about Duzallo
Is there a generic for Duzallo right now?
No. As of October 9, 2026 no generic allopurinol and lesinurad is listed for sale in the FDA NDC Directory.
When will Duzallo go generic?
February 2032 is the expected month, and that is probable but not certain. It is when Duzallo’s patent 8,546,436 ends. That patent covers the active ingredient, and once it ends, generics can go on sale as soon as the FDA approves them.
Will generic allopurinol and lesinurad be the same as Duzallo?
Yes in the ways that matter: the same active ingredient, strength and form, with proof that it reaches your blood the same way. Inactive ingredients can differ, which is why some people notice a different look or taste.
How much will the generic cost?
Nobody can say for sure before launch. No company is recorded as having applied to the FDA to make one yet, and a single company usually brings only a modest drop.
Has the FDA approved a generic Duzallo?
Not yet. The FDA Orange Book lists no approved generic version of Duzallo.
When does the Duzallo patent expire?
The FDA Orange Book lists 8 patents for Duzallo; the last runs to February 2032. The one behind the expected month is patent 8,546,436, which ends in February 2032. A patent date is not the launch date: settlements and court rulings often bring a generic earlier, and FDA approval or a company’s own plans can make it later. The expected month on this page (February 2032) weighs all of that.
Changes to This Projection
- First generic expected February 2032 on this month’s schedule. A line is added here whenever a monthly update moves the month, the reason or how sure it is.
Every change to the expected month is logged here with the month we saw it.
Also Going Generic
- LutatheraLutetium Lu 177 Dotatate2026 to 2027
- Trijardy XREmpagliflozin, Linagliptin, and Metformin Hydrochloride2032 to 2033
- GanciclovirGanciclovirSeptember 2034
- Zembrace SymTouchSumatriptan SuccinateJanuary 2036
- PyrukyndMitapivat Sulfate2038 to 2039
- CabtreoAdapalene, Benzoyl Peroxide, and Clindamycin PhosphateDecember 2040
About Duzallo
- Generic name allopurinol and lesinurad
- How it is taken By mouth
- Company Ironwood Pharmaceuticals Inc
- More drugs Brand-name drugs starting with D
- Have a question? A pharmacist answers, free. Ask about Duzallo
Sources. The expected month: FDA Paragraph IV Patent Certifications list, federal court records, company announcements and securities filings (settlement dates, launch plans, sales). The record on this page: FDA Orange Book, Drugs@FDA (tentative approvals), FDA NDC Directory, FDA, Generic Competition and Drug Prices (2019). Updated October 9, 2026. Information, not medical advice.