Prezcobix Generic: When Will It 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
Prezcobix Generic at a Glance
Four quick answers from FDA records and our estimate.
- When is the first generic expected? September 2029 About 3 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? October 2032 3 patents listed with the FDA Why is a generic expected sooner?
- Can you buy a generic today? Not yet No company lists one for sale
Generic cobicistat and darunavir ethanolate is expected to be available in September 2029, about 3 years away. None is for sale yet.
Why September 2029?
It is when Prezcobix’s patent 8,148,374 ends. That patent covers the active ingredient, the product’s formulation and a way of using it, and once it ends, generics should be able to go on sale as soon as the FDA approves them. We rate it probable: more likely than not, but it can still move.
If Prezcobix’s last patent runs to October 2032, how can a generic come sooner?
The patent that runs to October 2032 (10,039,718) covers the product’s formulation. A patent like that protects one way of making or using the medicine, not the medicine itself. A generic company can often make its version a different way or leave that use off its label, or a court can rule the patent invalid or not infringed. Generic companies have been challenging Prezcobix’s patents with the FDA since July 2020. That is why the expected month comes before the last protection ends. See the road to a generic
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, and more so as more companies sell one. One company has applied to the FDA to make it. In the FDA’s study of past launches, pharmacies paid about 31% less once one company sold a generic, which would take the $79.99 pharmacies pay per tablet for Prezcobix today to about $55.20. See the price estimate
What should I do now?
Keep taking Prezcobix 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.
Prezcobix 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
- Low 1 company has filed, 1 first in line
- Brand sales
- $548M a yearBig seller
- FDA approved 2015 January 2015 FDA Orange Book
- Patents listed 3 last runs to October 2032 A generic is expected sooner, in September 2029. See why FDA Orange Book
- Pharmacies pay $79.99 per tablet, up 0.6% in a year NADAC, October 2026
- Medicare Part D spent $242.7M in 2025, for 10.6K people CMS Part D Spending by Drug
- Medicaid prescriptions 30.6K in the last four reported quarters, $79.9M CMS Medicaid drug utilization, to Q1 2026
Prezcobix’s Road to a Generic
Prezcobix has had the market to itself since the FDA approved it in January 2015 (Janssen Products LP). Its 3 listed patents run to October 2032. Generic companies have challenged its patents with the FDA since July 2020.
The first generic of Prezcobix is expected in September 2029.
Why that month: patent 8,148,374, on the active ingredient, the product’s formulation and a way of using it, ends then. That is about 3 years before the last listed patent runs out, in October 2032.
Why a Generic Can Come Before October 2032
The last listed patent runs to October 2032, but it covers the product’s formulation, not the medicine itself, which a generic can often work around or challenge. Dr. Brian explains
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.
Prezcobix Patents and FDA Protections
Every patent and exclusivity the FDA Orange Book lists for Prezcobix’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 8,148,374, which ends in September 2029, the month the first generic is expected. Why the later ones may not hold it back
| Patent | What it covers | Protects until | Status |
|---|---|---|---|
| 7,700,645 | The active ingredient; the product’s formulation | June 2027 with the pediatric extension | Active |
| 8,148,374 Sets the expected month of generic availability | The active ingredient; the product’s formulation; a way of using it (U-1279, U-4162, U-2939) | September 2029 | Active |
| 10,039,718 | The product’s formulation | October 2032 | Active |
Source: FDA Orange Book, application 205395. Patent numbers open the patent on Google Patents.
Patent Challenges to Prezcobix
The first patent challenge to Prezcobix reached the FDA in July 2020, from one company on that first day. The FDA has not approved a first challenger’s generic yet.
What Is a Patent Challenge?
A generic company that wants to sell its version before Prezcobix’s patents run out can tell the FDA that a patent is invalid, or that its version does not infringe it. The FDA calls this a “Paragraph IV certification.” The brand company usually sues, and the FDA then generally cannot approve that generic for up to 30 months while the case runs. To reward going first, the companies that challenge first can get a 180-day head start: the FDA cannot approve the generics that came after them until it ends.
| Product | First challenged | Companies that day | 180-day head start | First challenger’s generic | Challenged patents run to | |
|---|---|---|---|---|---|---|
| Approved | On sale | |||||
| Tablets, 800 mg/150 mg | July 2020 | 1 company | No decision yet | Not yet | Not yet | October 2032 |
Source: the FDA’s Paragraph IV Patent Certifications list, as of September 2026. The FDA began posting the 180-day decisions and the first challenger’s approval and first sale in June 2019: an older entry it has not updated since reads “Not posted”, and “Not yet” means the list records no such event. “Companies that day” is the FDA’s count of challenges that arrived on the first day.
Who Is Lined Up to Make Generic Cobicistat and Darunavir Ethanolate
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
One company has applied to the FDA to make generic cobicistat and darunavir ethanolate.
The FDA names a company only once it approves its application, even tentatively, and it has not done that for this one yet, so the company is not named here. Names often come out in the brand company’s patent lawsuits or in the companies’ own announcements.
First in line. One of them was first in line: the first company to challenge the brand’s patents can earn 180 days on the market before the other generics, which is why being first matters.
Generic companies have challenged Prezcobix’s patents with the FDA since July 2020: see the patent challenges.
Approved by the FDA
Not yet. The FDA has not approved a generic cobicistat and darunavir ethanolate. Final approval often comes close to the day a generic can be sold.
For Sale in Pharmacies
Not yet. No company lists a generic cobicistat and darunavir ethanolate 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).
Prezcobix Price: What Pharmacies Pay and What Generics Usually Do
What Pharmacies Pay for Prezcobix 800 mg-150 mg tablet
$79.99 per tablet in October 2026, up 0.6% from a year earlier.
Hover over or tap anywhere on the chart to see that month’s price.
See the numbers
| Month | Pharmacies paid per tablet |
|---|---|
| October 2026 | $79.99 |
| September 2026 | $79.99 |
| August 2026 | $79.97 |
| July 2026 | $79.99 |
| June 2026 | $80.00 |
| May 2026 | $79.99 |
| April 2026 | $80.00 |
| March 2026 | $79.99 |
| February 2026 | $80.00 |
| January 2026 | $79.99 |
| February 2024 | $79.55 |
| January 2024 | $79.55 |
NADAC: the national average price retail pharmacies pay to buy the medicine (CMS survey, updated weekly), the last price of each month for one package. It is not what you pay: that depends on your insurance or discount card.
What a Generic Could Cost
How we estimate it. We start from what pharmacies pay for Prezcobix today: $79.99 per tablet for Prezcobix 800 mg-150 mg tablet in October 2026, from the national NADAC survey. Then we apply the FDA’s finding of how far that price 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). Prezcobix has one company lined up, so our estimate uses the figure for one company. More companies would bring the price lower; fewer, less of a drop.
Dollar figures apply FDA’s median drops to the $79.99 pharmacies pay per tablet today. An estimate from the pattern, not a price quote: what you pay depends on your insurance or discount card.
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.
What Medicare and Medicaid Spend on Prezcobix
Big public spending is part of why generic makers line up for a medicine, and why its first generic matters beyond the pharmacy counter. Figures are before manufacturer rebates, which are confidential.
Medicare Part D Spending
What Medicare drug plans spent on Prezcobix, before manufacturer rebates.
- $56M
- January to March 2026, the latest CMS has posted
For 8,723 people, about $2,487 per prescription fill - $242.7M
- 2025, the whole year
For 10,635 people, about $2,532 per prescription fill
See the numbers
| Period | Spending | People | Per fill |
|---|---|---|---|
| January to March 2026 | $55,993,726 | 8,723 | $2,486.95 |
| 2025 | $242,653,541 | 10,635 | $2,531.83 |
Source: CMS Medicare Part D Spending by Drug, matched by the brand name Prezcobix only, so no generic is counted in it. What CMS says it is used for: This product is used with other HIV medications to help control HIV infection. It helps to decrease the amount of HIV in your body so your immune system can work better.
Medicaid Prescriptions by Quarter
30,573 prescriptions in the four quarters to Q1 2026, $79.9M paid.
See the numbers
| Quarter | Prescriptions | Medicaid paid |
|---|---|---|
| Q1 2026 | 6,887 | $18,213,858 |
| Q4 2025 | 7,587 | $19,864,015 |
| Q3 2025 | 8,007 | $20,996,721 |
| Q2 2025 | 8,092 | $20,823,120 |
| Q1 2025 | 8,549 | $22,126,915 |
Source: CMS Medicaid State Drug Utilization Data, over Prezcobix’s own package codes.
Prezcobix Strengths and Forms
| Strength | Form | How it is taken | Approved | Status |
|---|---|---|---|---|
| 150MG;EQ 800MG BASE | Tablet | Oral | January 2015 | Prescription reference product |
| 150MG;EQ 675MG BASE | Tablet | Oral | March 2025 | Prescription reference product |
Source: FDA Orange Book, Janssen Products LP. Listed for sale today by Janssen Products LP, A-S Medication Solutions and Janssen Products, LP (FDA NDC Directory).
Prezcobix NDC Codes and Packages
Each Prezcobix package sold today has its own NDC, the product number printed on the box and on the pharmacy label. Open one to see that package’s details, what pharmacies pay for it and its patent timeline.
| NDC | Product | Package | Company |
|---|---|---|---|
| 59676-0578-30 | DARUNAVIR ETHANOLATE 675 mg/1 / COBICISTAT 150 mg/1 tablet, film coated | bottle of 30 tablets | Janssen Products, LP |
| 50090-1723-00 | DARUNAVIR ETHANOLATE 800 mg/1 / COBICISTAT 150 mg/1 tablet, film coated | bottle of 30 tablets | A-S Medication Solutions |
| 50090-1723-00 | DARUNAVIR ETHANOLATE 800 mg/1 / COBICISTAT 150 mg/1 tablet, film coated | bottle of 30 tablets | A-S Medication Solutions |
| 59676-0575-30 | DARUNAVIR ETHANOLATE 800 mg/1 / COBICISTAT 150 mg/1 tablet, film coated | bottle of 30 tablets | Janssen Products, LP |
| 59676-0575-30 | DARUNAVIR ETHANOLATE 800 mg/1 / COBICISTAT 150 mg/1 tablet, film coated | bottle of 30 tablets | Janssen Products, LP |
Source: the FDA NDC Directory, current listings only. Only packages sold under Prezcobix’s own FDA approval (NDA 205395) are listed, never a generic. Some codes belong to companies that repackage Prezcobix: it is the same medicine in a different package.
What a Generic Prezcobix Means for You
Nothing Changes Until It Is in Pharmacies
Until a generic is actually for sale, keep filling Prezcobix 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 Prezcobix”. 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 Prezcobix
Is there a generic for Prezcobix right now?
No. As of October 9, 2026 no generic cobicistat and darunavir ethanolate is listed for sale in the FDA NDC Directory.
When will Prezcobix go generic?
September 2029 is the expected month, and that is probable but not certain. It is when Prezcobix’s patent 8,148,374 ends. That patent covers the active ingredient, the product’s formulation and a way of using it, and once it ends, generics should be able to go on sale as soon as the FDA approves them. The last listed patent runs to October 2032, but it covers the product’s formulation, not the medicine itself, which a generic can often work around or challenge.
Will generic cobicistat and darunavir ethanolate be the same as Prezcobix?
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. One company has applied to the FDA to make it. In the FDA’s study of past launches, pharmacies paid about 31% less once one company sold a generic, which would take the $79.99 pharmacies pay per tablet for Prezcobix today to about $55.20. That is a pattern from past launches, not a prediction for this one.
Has the FDA approved a generic Prezcobix?
Not yet. The FDA Orange Book lists no approved generic version of Prezcobix.
When does the Prezcobix patent expire?
The FDA Orange Book lists 3 patents for Prezcobix; the last runs to October 2032. The one behind the expected month is patent 8,148,374, which ends in September 2029. 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 (September 2029) weighs all of that.
Has anyone challenged the Prezcobix patents?
Yes. The first patent challenge to Prezcobix reached the FDA in July 2020, from one company on that first day. The FDA has not approved a first challenger’s generic yet. A patent challenge (a “Paragraph IV certification”) is a generic company telling the FDA that a patent listed for the brand is invalid or will not be infringed by its version. The first companies to file one can earn a 180-day head start, during which the FDA cannot approve the generics that filed after them.
How much does Prezcobix cost now?
Pharmacies paid about $79.99 per tablet for Prezcobix 800 mg-150 mg tablet in October 2026, by the national survey of what pharmacies pay (NADAC). That is the pharmacy’s cost, not your price: what you pay depends on your insurance or discount card.
Changes to This Projection
- First generic expected September 2029 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
- Signifor LARPasireotide PamoateMay 2028
- VocabriaCabotegravir SodiumFebruary 2031
- DuvyzatGivinostat HydrochlorideMay 2036
- OgsiveoNirogacestat2037 to 2038
- ItovebiInavolisibOctober 2038
- AnnoveraEthinyl Estradiol and Segesterone AcetateJune 2039
About Prezcobix
- Generic name cobicistat and darunavir ethanolate
- How it is taken By mouth
- Company Janssen Products LP
- Patent challenges Since July 2020 (FDA)
- More drugs Brand-name drugs starting with P
- Have a question? A pharmacist answers, free. Ask about Prezcobix
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 Paragraph IV Patent Certifications list, NADAC (CMS), CMS Medicare Part D Spending by Drug, Medicaid State Drug Utilization Data, FDA, Generic Competition and Drug Prices (2019). Updated October 9, 2026. Information, not medical advice.