Mounjaro Lawsuit

More than 1,000 reports of severe gastrointestinal issues have piled up in the FDA’s database for drugs like Mounjaro, and that number isn’t slowing down.

People taking this popular diabetes and weight loss injection have landed in emergency rooms, diagnosed with stomach paralysis, blocked intestines, and other brutal side effects. And now, they're demanding accountability.

If Mounjaro wrecked your body, you might have legal options. Call (833) 552-7274 today or contact us online. LitigationConnect’s network of lawyers is ready to review your case. We’ll connect you with a local attorney who knows how to handle dangerous drug claims, fast.

Understanding Mounjaro Lawsuits

Multidistrict Litigation on the Horizon

No one wants to argue 500 nearly identical cases in 500 different courtrooms. That’s where MDLs come in. When lawsuits involve the same drug, the same injuries, and the same defendant, they’re often consolidated into a single federal court for pretrial.

Mounjaro lawsuits haven’t officially merged into an MDL yet, but attorneys are circling. With Ozempic, Wegovy, and other GLP-1 drugs already facing similar claims, the momentum is building.

And that means this litigation wave is only just getting started.

Alleged Side Effects Leading to Lawsuits

Most medications come with warnings, but what’s showing up in Mounjaro users goes far beyond manageable discomfort. The reported side effects involve serious disruptions to the digestive system—conditions that have permanently altered people’s health and led to mounting legal action.

Gastroparesis: Stomach Paralysis With Long-Term Consequences

Gastroparesis occurs when the muscles of the stomach stop working properly. Food stays in the stomach for hours, sometimes days, without moving through the digestive tract. Patients report severe nausea, abdominal pain, early fullness, bloating, and chronic vomiting. In some cases, they’ve required feeding tubes or surgical treatment to prevent malnutrition.

Plaintiffs have connected the timing of their symptoms directly to starting Mounjaro. Diagnostic tests like gastric emptying scans back up those claims, showing abnormal delays in digestion. Medical histories submitted in these lawsuits show no signs of gastroparesis before taking the drug.

Claims of this nature fall under failure-to-warn and defective design theories of liability. Under California’s Civil Code § 1714.45, drug manufacturers can be held accountable if they release a product that carries hidden dangers and don’t provide sufficient warnings. When patients develop permanent gastrointestinal damage without adequate warning, that liability becomes harder to avoid.

Intestinal Blockages: When the Digestive Tract Shuts Down

Some patients have experienced full intestinal blockages. These cases involve severe abdominal pain, vomiting, distention, and hospitalizations requiring emergency surgery. In legal filings, plaintiffs describe the formation of bezoars—solid masses of undigested material—that led to total obstruction of the intestines.

These injuries have been documented through imaging, surgical records, and hospital discharge summaries. They point to extreme gastric slowdown that interfered with the body’s ability to process food safely.

Texas law, through Chapter 82 of the Civil Practice and Remedies Code, allows plaintiffs to pursue strict product liability claims if the drug’s design or warnings created an unreasonable risk of harm. Intestinal blockages meet that standard when medical evidence links them directly to use of the medication.

Severe, Ongoing Nausea and Vomiting

Mounjaro’s label mentions nausea and vomiting, but lawsuits describe these symptoms as intense, constant, and completely disruptive. Multiple reports include vomiting daily for extended periods, severe dehydration, and hospital admissions for fluid and electrolyte management.

This level of reaction moves well past inconvenience. Patients unable to hold down food or water are not managing side effects—they’re suffering chronic injuries. 

Basis of Legal Claims

Once the symptoms start disrupting a person’s life—multiple hospital visits, missed work, surgical procedures—the question naturally shifts to accountability. The legal claims filed against Eli Lilly focus on what the company did, what it failed to do, and what those decisions cost real people.

Failure to Warn

Drug labels exist for one reason: informed consent. Patients agree to take a medication based on the risks they know about. When key risks are left off the label, the consent becomes meaningless.

Plaintiffs argue that Eli Lilly failed to include known or foreseeable gastrointestinal risks on Mounjaro’s label. While the company disclosed general side effects such as nausea and diarrhea, the lawsuits claim they omitted the severity, frequency, and permanence of certain reactions.

Under product liability law, this falls squarely under a failure-to-warn theory. In California, for example, courts use the “consumer expectations test” to determine whether a warning was adequate. If a typical consumer would not anticipate the severity of the side effect based on the provided information, the manufacturer may be liable.

Failure-to-warn claims also rely on what the company knew and when. If internal data or adverse event reports suggested serious digestive complications before or shortly after release—and those risks weren’t communicated—plaintiffs gain more leverage.

Negligence

Negligence doesn’t require intentional harm. It just requires carelessness that causes damage. The legal argument here is straightforward: Eli Lilly had a duty to make a safe product and to disclose material risks. If the company fell short on either, and patients suffered as a result, that breach forms the basis of a negligence claim.

Plaintiffs allege that the company failed to conduct sufficient post-market surveillance or investigate reports of serious side effects. Some claims go further, alleging that Eli Lilly downplayed or ignored red flags to protect Mounjaro’s marketability.

These accusations carry weight in jurisdictions like New York, where courts apply a basic negligence standard: duty, breach, causation, and damages. Once a plaintiff shows that the drug caused their injury and that the injury was preventable with proper diligence, the claim moves forward.

Product Liability

Product liability claims rest on the theory that the drug was unreasonably dangerous due to its design, manufacturing, or labeling. In the Mounjaro lawsuits, plaintiffs focus primarily on design and labeling.

Design defect claims argue that the medication’s intended function causes harm when used as directed. If the drug’s mechanism—altering gut hormone activity—leads to functional organ damage in a predictable number of patients, that raises red flags about the drug’s design.

Most states follow one of two tests for design defect: the consumer expectations test or the risk-utility test. The former looks at whether the product performed as safely as an ordinary consumer would expect. The latter asks whether the benefits of the design outweigh the risks, and whether a safer alternative was feasible.

Eligibility Criteria for Filing a Lawsuit

To move forward with a Mounjaro claim, plaintiffs need more than symptoms—they need documentation that connects their condition directly to the drug and meets the standards courts use to decide who qualifies to sue.

Proof of Mounjaro Use

First, plaintiffs must show that they actually took Mounjaro. That sounds obvious, but it means producing real records:

• pharmacy receipts
• prescription histories
• physician notes confirming dosage and duration

Self-reported use, social media posts, or anecdotal claims don’t meet the bar. Courts require verifiable, dated proof that ties the individual to the product in question. Without it, the case doesn’t even reach the starting line.

This is particularly important in mass tort litigation, where thousands of claims move through the system. Federal courts reviewing these cases will throw out any complaint that lacks credible proof of use.

Age and Health Factors

Some law firms consider a plaintiff’s age and general health before accepting a case. This isn’t about discrimination—it’s about building a case that can survive cross-examination. For example, if a patient had pre-existing gastrointestinal issues before starting Mounjaro, defense attorneys will try to argue that the drug played no role.

That’s why some firms screen out claimants who:

• have long-standing GI conditions like IBS or Crohn’s
• are over a certain age where multiple health factors muddy causation
• lack consistent medical follow-up documenting the injury

Firms invest time and money into litigation, so they want plaintiffs whose cases stand up to scrutiny. A clean medical history, a clear timeline, and credible documentation make a claim easier to pursue.

Steps to Take if Affected

Get a Medical Evaluation

Before anything else, patients need a real diagnosis. That means seeing a doctor—not Googling symptoms, not self-diagnosing, and not hoping it passes. Gastroenterologists handle these cases. They run gastric emptying tests, order imaging, and review full medical histories. These evaluations do more than treat symptoms—they lock in a timeline. They create objective records of what happened and when.

Judges don’t care about pain levels unless they’re documented. So if the drug caused vomiting, bloating, or a blockage, it needs to show up in hospital records, lab results, and diagnostic imaging. The earlier that evaluation happens, the easier it becomes to tie the injury to the drug.

Organize the Paper Trail

Legal claims demand receipts—literally. Plaintiffs need to compile:

• prescription records showing when Mounjaro was filled
• dosage instructions from the prescriber
• dates of use and any medication adjustments
• hospital or emergency room records
• diagnostic results from GI specialists
• progress notes from follow-up visits

The stronger the paper trail, the less room the defense has to claim the injury came from something else. Timelines matter. A prescription filled in January, followed by symptoms in February and a gastroparesis diagnosis in March, carries weight.

In product liability cases, especially under statutes like California’s Evidence Code § 1150, courts rely heavily on contemporaneous documentation to establish causation and credibility.

Contact an Attorney Familiar with Pharmaceutical Litigation

This isn’t the kind of lawsuit that fits a generic template. Pharmaceutical injury cases involve strict statutes, scientific evidence, and aggressive corporate defense teams. A qualified attorney—preferably one with experience in mass torts or dangerous drug litigation—knows how to structure these claims.

They’ll review the facts, evaluate timelines, and assess whether the injuries meet the threshold for filing. Most of them work on contingency, which means no upfront cost. But they don’t take every case. They need evidence, documentation, and a claim that won’t collapse during discovery.

Lawyers also make sure deadlines aren’t missed. Every state has its own statute of limitations. Wait too long, and the right to sue disappears even if the evidence is airtight.

Hold Drugmakers Accountable

Pharma giants don’t flinch until they’re forced into a courtroom. If Mounjaro wrecked your health, you have every right to push back—and get paid for what you’ve been through. Your pain isn’t a side effect. It’s evidence.

Call (833) 552-7274 today or contact us online. LitigationConnect will match you with a lawyer who’s ready to fight, not settle.