For years, millions of Americans reached for Prevacid (lansoprazole) to alleviate chronic heartburn, often taking it every day by prescription or straight off the pharmacy shelf. But now people who used the drug long-term are pursuing lawsuits alleging Prevacid caused them to develop stomach cancer.
These lawsuits allege that lansoprazole, the active ingredient in Prevacid, can raise the risk of gastric cancer when taken over long periods, and that Takeda never warned patients or their doctors. Attorneys say the science behind the gastric cancer allegations has been building for decades.
If you or someone in your family was diagnosed with stomach cancer following long-term Prevacid use, you may qualify for a lawsuit. Wisner Baum is reviewing and filing these cases across the country. Call (310) 207-3233 or contact us for a free, confidential case evaluation.
What Is Prevacid (Lansoprazole)?
Prevacid is the brand name for lansoprazole, a proton pump inhibitor (PPI) that curbs stomach acid by switching off the tiny “pumps” in the stomach lining that release it. First approved in the United States in 1995, Prevacid spent years as one of the country's top-selling heartburn medications.
One of the reasons lansoprazole became widely used is its many variations. Along with the standard delayed-release capsule, Takeda sells Prevacid SoluTab, a tablet that dissolves on the tongue for patients who struggle to swallow pills. And since 2009, a lower-dose version has been sold without a prescription as Prevacid 24HR, brought to drugstore shelves under a license from Takeda. Between the prescription and over-the-counter options, it has been easy for people to stay on lansoprazole for months or years at a time.
Studies Link Long-Term Prevacid Use to Stomach Cancer
The Biology: Acid, Gastrin, and the Stomach Lining
Prevacid works by sharply lowering stomach acid. However, the body does not sit still when stomach acid levels drop. To push back, it releases more of a hormone called gastrin, and when a PPI is taken for a long stretch, gastrin can climb and stay high, a state doctors call hypergastrinemia.
Gastrin tells cells to grow, and researchers have long worried that years of this over-signaling can drive certain acid-regulating cells in the stomach lining (known as ECL cells) to multiply abnormally, a process that, for some, may set the stage for cancer.
There is a second concern as well. Stomach acid is part of the body's defenses, killing bacteria before they take hold. Strip that acid away for years, lawsuits allege, and bacteria can flourish — some of them producing nitrosamines, compounds classified as probable carcinogens. Both pathways point the same way: the longer someone stays on a PPI like Prevacid, attorneys say, the more the risk appears to build.
Two Decades of Research
The connection between long-term PPI use and stomach cancer is not one study — it is an accumulating body of evidence:
- Back in 2006, researchers reporting in the journal Gut found that people who had used PPIs for more than three years faced roughly three times the gastric cancer risk of people taking older H2-blocker acid reducers (study).
- A large 2017 study in BMJ Open, tracking PPI users across Sweden's entire population, again landed on about a threefold increase among long-term “maintenance” users (study).
- The most striking numbers came in 2018, when a study in Gut following patients after H. pylori treatment found that those who kept taking a PPI daily for three or more years had more than eight times the risk of non-users (study).
- By 2025, a sweeping review in BMJ Open Gastroenterology had pulled the evidence together — 20 of 21 meta-analyses showed elevated risk — leading its authors to call the case for a link “quite convincing” (review).
None of this proves what caused any one person's cancer; that always comes down to the individual's own history and use. But it is the foundation the Prevacid lawsuits are built on.
Not the Same as the Old PPI Kidney Lawsuits
You may have heard about PPI lawsuits before; they were almost certainly about kidney damage, not cancer. Years ago, patients alleged that PPIs caused kidney problems like chronic kidney disease, and those cases were gathered into a single proceeding in New Jersey federal court (MDL No. 2789). Takeda was among the manufacturers that agreed to resolve the kidney damage litigation.
The kidney cases are largely over and will not have any direct impact on the emerging stomach cancer claims. Cancer is a different injury backed by different science. While the earlier kidney settlements say nothing about what a stomach cancer case might be worth, they show that PPI injury claims have previously driven major resolutions.
Allegations in Prevacid Gastric Cancer Lawsuits
At their core, Prevacid gastric cancer lawsuits are product liability claims. They argue that Prevacid was sold without an honest accounting of its long-term risks. Plaintiffs' attorneys contend that Takeda had the same decades of animal research, case reports, and published studies as everyone else; the company either knew or should have known about the research-backed stomach cancer link but failed to warn people.
Specifically, Prevacid lawsuits allege that:
- Neither the prescription Prevacid label nor the over-the-counter Prevacid 24HR box tells patients that taking the drug for years may raise their risk of stomach cancer.
- The labels also say nothing about “rebound” — the surge of acid that hits when someone stops a PPI, which can push them right back onto the drug and into the kind of long-term use these cases tie to cancer.
From there, the claims follow familiar product-liability theories: failure to warn, defective design, negligence, fraudulent concealment, breach of warranty, and — for families who have lost someone — wrongful death. Many also argue that safer ways to treat acid reflux existed all along.
Think long-term Prevacid use may be behind a stomach cancer diagnosis? A free review with Wisner Baum can tell you where you stand. Call (310) 207-3233 or contact us.
Who Can File a Prevacid Lawsuit?
You may be able to bring a Prevacid stomach cancer claim if the basics below fit your situation — or that of a family member who has passed away:
- Long-term lansoprazole use — prescription Prevacid, Prevacid SoluTab, over-the-counter Prevacid 24HR, or the generic — typically for a year or more.
- A diagnosis of stomach or gastric cancer, such as gastric adenocarcinoma.
- A diagnosis that still falls within your state's filing deadline (its statute of limitations).
Prescription and over-the-counter use both count, and so does generic lansoprazole, since it is the same medicine. If you are not sure your history qualifies, a free review is the fastest way to find out — at no cost and no obligation.
What a Lansoprazole Claim Might Recover
No attorney can promise a result, and every case turns on its own facts. That said, people who succeed in a lansoprazole lawsuit may recover compensation for their cancer treatment and medical bills, the income and earning power lost to the illness, the physical pain and emotional toll of the diagnosis, and, when a family has lost a loved one, wrongful death damages. Where a manufacturer's conduct is shown to be especially reckless, a jury may add punitive damages meant to punish and deter. What any one case is worth depends entirely on the specifics.
Don't Wait Too Long to File
Every state puts a clock on cases like these. It is called the statute of limitations, and it usually gives you only a few years — measured from the cancer diagnosis, or from the point you reasonably could have connected the cancer to the drug. Miss it, and the claim can be gone for good. Because the deadlines differ from state to state and are easy to underestimate, the safest move is to have a lawyer look at your timeline sooner rather than later. Getting started is simple: a free consultation, a review of your pharmacy and medical records to confirm your Prevacid use and diagnosis, and, if it makes sense, a lawsuit filed on your behalf.
Why Families Choose Wisner Baum for Their Prevacid Stomach Cancer Claim
Wisner Baum has spent four decades taking on drug and product manufacturers, winning more than $4 billion in verdicts and settlements for thousands of clients.
Our firm is perhaps best known for its work against Monsanto, where managing partner R. Brent Wisner was co-lead trial counsel in Pilliod v. Monsanto. In that case, a California jury returned a $2.055 billion verdict (later reduced by the court). Wisner, along with attorney and partner Monique Alarcon, filed one of the first PPI stomach cancer cases in the country. Together they bring a proven, trial-ready team to ongoing PPI stomach cancer claims.
There is no financial risk in getting started with a case. Wisner Baum Prevacid lawyers work on contingency, so if we do not win your case, you owe us nothing in attorney's fees.
Talk to a Prevacid Lawyer for Free
A stomach cancer diagnosis after years on Prevacid is worth a conversation — and the conversation costs nothing. The pharmaceutical team at Wisner Baum is reviewing these claims now. Call (310) 207-3233 or contact us to set up a free, confidential case evaluation. You pay no attorneys’ fees unless we win.
