Xdemvy Generic: When Will Generic Lotilaner 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
Xdemvy Generic at a Glance
Four quick answers from FDA records and our estimate.
- When is the first generic expected? 2036 to 2037 A wide window 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? December 2038 9 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 lotilaner is expected to be available between 2036 and 2037. None is for sale yet.
Why 2036 to 2037?
The patent fight is likely to end in an agreement that sets the launch. The terms are not public yet. We rate it probable: more likely than not, but it can still move.
If Xdemvy’s last patent runs to December 2038, how can a generic come sooner?
The 8 patents that run past the expected month, to December 2038 (10,835,517, 11,197,847, 11,690,826, 11,690,827 and 4 more), cover a way of using it and 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. Here, the companies are expected to settle on a date. 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, 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 Xdemvy 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.
Xdemvy by the Numbers
- Reason
- Settlement expectedThe patent fight is likely to end in an agreement that sets the launch. The terms are not public yet.
- How sure
- Probable More likely than not, but it can still move.
- Price competition
- None filed yet No filers on record
- Brand sales
- $820M a yearBig seller
- FDA approved 2023 July 2023 FDA Orange Book
- Patents listed 9 last runs to December 2038 A generic is expected sooner, between 2036 and 2037. See why FDA Orange Book
- Medicare Part D spent $341.5M in 2025, for 160.3K people CMS Part D Spending by Drug
- Medicaid prescriptions 15.7K in the last four reported quarters, $30.7M CMS Medicaid drug utilization, to Q1 2026
Xdemvy’s Road to a Generic
Xdemvy has had the market to itself since the FDA approved it in July 2023 (Tarsus Pharmaceuticals Inc). Its FDA protection (new chemical entity) runs to July 2028. Its 9 listed patents run to December 2038.
The first generic of Xdemvy is expected between 2036 and 2037.
Why that month: the patent fight is likely to end in an agreement that sets the launch. The terms are not public yet.
Why a Generic Can Come Before December 2038
The last listed patent runs to December 2038, but it covers a way of using it and 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.
Xdemvy Patents and FDA Protections
Every patent and exclusivity the FDA Orange Book lists for Xdemvy’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.
| Patent | What it covers | Protects until | Status |
|---|---|---|---|
| 8,383,659 | The active ingredient; the product’s formulation | January 2030 | Active |
| 10,835,517 | A way of using it (U-3674) | December 2038 | Active |
| 11,197,847 | A way of using it (U-3674) | December 2038 | Active |
| 11,690,826 | A way of using it (U-3674) | December 2038 | Active |
| 11,690,827 | A way of using it (U-3674) | December 2038 | Active |
| 11,752,137 | The product’s formulation | December 2038 | Active |
| 12,171,750 | A way of using it (U-3674) | December 2038 | Active |
| 12,213,964 | The product’s formulation | December 2038 | Active |
| 12,364,685 | The product’s formulation | December 2038 | Active |
| Exclusivity | What it means | Ends | Status |
|---|---|---|---|
| New chemical entity NCE | Five years of protection for a medicine whose active ingredient the FDA had never approved before. | July 2028 | Active |
Source: FDA Orange Book, application 217603. Patent numbers open the patent on Google Patents.
Who Is Lined Up to Make Generic Lotilaner
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 Xdemvy yet.
Approved by the FDA
Not yet. The FDA has not approved a generic lotilaner. Final approval often comes close to the day a generic can be sold.
For Sale in Pharmacies
Not yet. No company lists a generic lotilaner 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).
Xdemvy 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 Xdemvy, 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.
What Medicare and Medicaid Spend on Xdemvy
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 Xdemvy, before manufacturer rebates.
- $112.8M
- January to March 2026, the latest CMS has posted
For 54,060 people, about $1,988 per prescription fill - $341.5M
- 2025, the whole year
For 160,278 people, about $1,960 per prescription fill
See the numbers
| Period | Spending | People | Per fill |
|---|---|---|---|
| January to March 2026 | $112,818,176 | 54,060 | $1,988.09 |
| 2025 | $341,484,280 | 160,278 | $1,959.90 |
Source: CMS Medicare Part D Spending by Drug, matched by the brand name Xdemvy only, so no generic is counted in it. What CMS says it is used for: This medication is used to treat a parasitic infection of the eye (Demodex blepharitis) that can especially affect the eyelids. It belongs to a class of drugs known as antiparasitics.
Medicaid Prescriptions by Quarter
15,704 prescriptions in the four quarters to Q1 2026, $30.7M paid.
See the numbers
| Quarter | Prescriptions | Medicaid paid |
|---|---|---|
| Q1 2026 | 4,556 | $9,140,634 |
| Q4 2025 | 4,446 | $8,615,535 |
| Q3 2025 | 3,620 | $6,998,211 |
| Q2 2025 | 3,082 | $5,979,487 |
| Q1 2025 | 2,369 | $4,611,139 |
Source: CMS Medicaid State Drug Utilization Data, over Xdemvy’s own package codes.
Xdemvy Strengths and Forms
| Strength | Form | How it is taken | Approved | Status |
|---|---|---|---|---|
| 0.25% | Solution/drops | Ophthalmic | July 2023 | Prescription reference product |
Source: FDA Orange Book, Tarsus Pharmaceuticals Inc. Listed for sale today by Tarsus Pharmaceuticals, Inc. (FDA NDC Directory).
Xdemvy NDC Codes and Packages
Each Xdemvy 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 |
|---|---|---|---|
| 81942-0125-01 | LOTILANER 2.5 mg/mL solution/ drops | bottle of 10 mL | Tarsus Pharmaceuticals, Inc. |
| 81942-0125-01 | LOTILANER 2.5 mg/mL solution/ drops | bottle of 10 mL | Tarsus Pharmaceuticals, Inc. |
| 81942-0125-99 | LOTILANER 2.5 mg/mL solution/ drops | bottle of 1.5 mL | Tarsus Pharmaceuticals, Inc. |
| 81942-0125-99 | LOTILANER 2.5 mg/mL solution/ drops | bottle of 1.5 mL | Tarsus Pharmaceuticals, Inc. |
Source: the FDA NDC Directory, current listings only. Only packages sold under Xdemvy’s own FDA approval (NDA 217603) are listed, never a generic. Some codes belong to companies that repackage Xdemvy: it is the same medicine in a different package.
What a Generic Xdemvy Means for You
Nothing Changes Until It Is in Pharmacies
Until a generic is actually for sale, keep filling Xdemvy 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 Xdemvy”. 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 Xdemvy
Is there a generic for Xdemvy right now?
No. As of October 9, 2026 no generic lotilaner is listed for sale in the FDA NDC Directory.
When will Xdemvy go generic?
2036 to 2037 is the expected window, and that is probable but not certain. The patent fight is likely to end in an agreement that sets the launch. The terms are not public yet. The last listed patent runs to December 2038, but it covers a way of using it and the product’s formulation, not the medicine itself, which a generic can often work around or challenge.
Will generic lotilaner be the same as Xdemvy?
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 Xdemvy?
Not yet. The FDA Orange Book lists no approved generic version of Xdemvy.
When does the Xdemvy patent expire?
The FDA Orange Book lists 9 patents for Xdemvy; the last runs to December 2038. 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 window on this page (2036 to 2037) weighs all of that.
Changes to This Projection
- First generic expected 2036 to 2037 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
- DaurismoGlasdegib MaleateNovember 2032
- VanflytaQuizartinib HydrochlorideSeptember 2033
- Absorica LDIsotretinoinMay 2035
- IlluccixGallium Ga-68 GozetotideJuly 2035
- RezzayoRezafunginJuly 2038
- NereusTradipitantApril 2039
About Xdemvy
- Generic name lotilaner
- How it is taken In the eye
- Company Tarsus Pharmaceuticals Inc
- More drugs Brand-name drugs starting with X
- Have a question? A pharmacist answers, free. Ask about Xdemvy
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, 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.