How to Join the Dupixent Lawsuit

Find Out If You Have a Case

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There is no sign-up sheet for the Dupixent lawsuit. MDL 3180 is not a class action you join with a form; it is a collection of individual lawsuits, each filed by a lawyer for one patient and then transferred to one federal court for pretrial work. “Joining” means having your own case reviewed, accepted and filed. Here is exactly how that happens, what you need, and how long each step takes.

As of September 15, 2026: at least 36 member actions identified in MDL 3180. See the member-case ledger on the MDL 3180 tracker.

Can you sign up for the Dupixent lawsuit online?

You can start online, but you cannot “sign up” the way a class action settlement lets you submit a claim form. Federal Dupixent T-cell lymphoma cases are consolidated in MDL 3180; a lawyer files a complaint in your name and it is transferred there. What you can do online today is a free two-minute claim review that tells you whether your diagnosis and prescription history fit the filed cases.

Step 1 — Confirm the diagnosis fits

The filed cases involve cutaneous T-cell lymphoma (including mycosis fungoides and Sézary syndrome) and other T-cell lymphomas diagnosed after Dupixent use. The full criteria are on do I qualify; lymphoma types are explained on qualifying lymphoma types. A lymphoma first treated as worsening eczema does not disqualify you; see misdiagnosed eczema.

Step 2 — Gather what you can (and don’t wait for what you can’t)

• The pathology report and the date of diagnosis.
• Prescription history: when Dupixent started and stopped, and for what condition.
• Names of the prescribing dermatologist or allergist and the treating oncologist.
• Dermatology visit records from before the diagnosis, if you have them.
• Pharmacy records or the manufacturer’s patient-support enrollment.

Missing items do not stop a review; records requests are part of the process. See evidence: what to save.

Step 3 — Free claim review

The review is a short call or the online form: diagnosis, dates, what Dupixent was prescribed for, and your state. You are told at the end whether the case fits, what is unclear, and what records would settle it. There is no charge for the review and no fee unless there is a recovery.

Step 4 — Signed authorization and records

If the case fits, you sign an authorization that lets the firm request pathology, dermatology and pharmacy records. This is not a retainer; it lets the work start. Records usually take two to eight weeks to arrive.

Step 5 — Case acceptance and the engagement agreement

With records in hand, the case is either accepted or you are told plainly why not. Acceptance comes with a written engagement agreement that sets out the contingency percentage and how case expenses are handled. Read it before signing; there are no upfront costs.

Step 6 — Filing and transfer into MDL 3180

Your complaint is filed and transferred into MDL 3180 for consolidated pretrial proceedings; the transfer order is explained on the JPML transfer order. From that point your case moves with the litigation — discovery, bellwether selection, settlement talks — and you are updated as the docket changes.

Deadlines: how long you have to join

Each state sets its own statute of limitations; most count from the diagnosis under a discovery rule, and some allow as little as one year. Our state pages cover the rules for every state; the deadline analysis is part of the free review, so call before assuming you are out of time.

What joining does not require

You do not need to stop Dupixent (that is a medical decision for you and your doctor; see still taking Dupixent?), you do not need a claim against your prescriber (the claim is against Sanofi and Regeneron; see why), you do not need to pay anything, and you do not need to travel.

Frequently asked questions