Mounjaro Lawsuits: Side Effects and Legal Options

Mounjaro (tirzepatide) has become a widely prescribed medication for managing type 2 diabetes and, more recently, for off-label weight loss. As a dual GIP and GLP-1 receptor agonist, it has been marketed as a powerful solution, often compared to medications like Ozempic and Wegovy. 

But despite its popularity, troubling side effects like gastroparesis (stomach paralysis) have led to a growing number of lawsuits, personal injury claims, and national scrutiny.

At Morgan & Morgan, we’re helping patients hold pharmaceutical companies accountable for serious and unexpected complications, and our firm has filed a lawsuit against Eli Lilly, the manufacturer of Mounjaro. If you or a loved one has suffered severe side effects from this drug, you may have a valid case against the manufacturer. 

The lawsuit points out that many plaintiffs have complained of stomach-related complications, most notably gastroparesis. Some of the plaintiffs we’ve spoken to have experienced severe vomiting from taking this medication, among other serious gastrointestinal problems we are actively investigating. 

Does this sound like something you or your beloved is dealing with after taking Mounjaro? Get your free case evaluation today; you might be eligible for some form of compensation.

What Is Mounjaro? 

Mounjaro falls within a novel category of medications commonly known as GLP-1 agonists. These medications aid individuals dealing with Type 2 diabetes in regulating their blood sugar levels. Additionally, studies have shown that they can also help with weight loss in some cases.

How Do GLP-1 Medications Work? 

These medications partially decelerate the rate at which food travels through the stomach. This effect contributes to an extended sensation of fullness among users since the food stays longer than usual in the stomach. As a result, they tend to eat less, and that’s how they end up losing weight.

Comparing Mounjaro to Other GLP-1 Agonists (Ozempic, Wegovy)

Although Ozempic, Wegovy, and Mounjaro all fall under the GLP-1 receptor agonist class of medications, lawsuits related to these drugs differ in a few key ways.

Mounjaro

Mounjaro contains tirzepatide, a dual GIP and GLP-1 agonist. It is approved for type 2 diabetes but is often used off-label for weight loss. Mounjaro lawsuits are newer than those against other similar drugs, but emerging claims focus on similar GI complications.

Ozempic

This injectable drug is approved for the treatment of type 2 diabetes but is often prescribed off-label for weight loss. Lawsuits primarily allege gastroparesis and ileus (intestinal blockage).

 

Wegovy

Wegovy is approved specifically for chronic weight management and contains the same active ingredient (semaglutide) as Ozempic. Reports contain similar claims of GI side effects, particularly in off-label or long-term users.

Each case depends on the specific drug taken, the timeline of symptoms, and how the prescribing physician framed the risks. Plaintiffs allege that drug manufacturers failed to adequately warn users of the potential for irreversible stomach damage, even when the drug was used as prescribed.

What Is the Basis of the Mounjaro Lawsuit?

Manufacturers, big and small, have a duty to warn consumers about the dangers of using their products. This duty is taken even more seriously in the pharmaceutical industry. The company’s failure to warn consumers about the possible gastrointestinal side effects of using Mounjaro means they are responsible for any damages that might have resulted from such consumption.

Early Warning Signs of Gastroparesis From Mounjaro

Gastroparesis, or “stomach paralysis,” is a condition where the stomach muscles don’t contract properly, delaying digestion. In extreme cases, food remains in the stomach for hours or even days, leading to debilitating symptoms.

Symptoms can include:

• Persistent nausea
• Vomiting undigested food hours after eating
• Early satiety (feeling full quickly)
• Abdominal bloating
• Stomach pain or cramping
• Unexplained weight loss
• Blood sugar fluctuations

If you're experiencing any of these symptoms while taking Mounjaro, speak with your doctor immediately. Delayed treatment may lead to hospitalization, malnutrition, or the need for feeding tubes.

Legal Process Timeline: From Filing to Settlement

If you believe Mounjaro caused your injury, the legal process can vary depending on the specifics of each case, but here’s what the legal process generally looks like:

1. Free Consultation

Morgan & Morgan offers a no-cost case evaluation. We’ll review your medical history and prescription records.

2. Evidence Collection

We’ll gather proof, including:

• Prescription records
• Medical evaluations/diagnoses
• Imaging and test results (e.g., gastric emptying scans)
• Doctor and hospital records
• Witness statements (if available)

3. Filing Your Claim

We file your complaint either individually or as part of mass tort litigation (if cases are being consolidated nationally).

4. Discovery Phase

Each side investigates. Defendants may request your records or depose witnesses. We’ll prepare every detail to support your case.

5. Negotiation or Trial

Most cases settle before trial, but we prepare every case as if it will go before a jury. You’ll have strong advocates every step of the way.

6. Payout

If successful, you may be entitled to compensation for:

• Medical expenses
• Lost wages
• Pain and suffering
• Future care or surgeries
  
   

Mounjaro Lawsuit Updates: Latest Filings and Class Action Status

As of mid-2025, lawsuits related to Mounjaro are still in the early stages but are gaining momentum. They are not yet part of a certified class action, but multidistrict litigation (MDL) is being considered, similar to what occurred with Ozempic and Wegovy.

Currently, dozens of individual cases have been filed in federal court, with plaintiffs alleging that Eli Lilly failed to adequately warn about the risk of gastroparesis and other serious complications.

Legal observers expect that these cases could be consolidated into an MDL within the next year.

If you're considering filing, now is the time before any deadlines or statutes of limitation expire.

What Evidence Do I Need to File a Mounjaro Lawsuit?

Strong claims require strong documentation. Here’s what we recommend gathering:

• Proof of prescription (pharmacy records or medication bottles)
• Medical diagnosis of gastroparesis or similar GI disorder
• Treatment records (hospital visits, imaging, specialist notes)
• Before-and-after documentation (symptom onset timeline)
• Employment records showing missed work (if applicable)

Don’t worry if you don’t have everything. Our team can help collect the necessary documents during your intake and investigation phase.

Is Gastroparesis From Mounjaro Permanent or Treatable?

The severity of gastroparesis varies. For some, symptoms improve when the drug is discontinued. For others, damage to the stomach muscles and nerves may be permanent.

Treatment options can include:

• Dietary modifications (liquid meals, small portions)
• Medications to stimulate gastric emptying
• Feeding tubes in severe cases
• Total parenteral nutrition (TPN) for long-term care

There is no guaranteed cure, especially in drug-induced cases. That’s why early legal and medical intervention is critical.

How Is Morgan & Morgan Handling the Mounjaro Cases Differently?

With over 35 years of experience in mass tort litigation, Morgan & Morgan approaches each case with a combination of deep medical knowledge from consulting physicians and advanced legal tech for managing complex litigation.

Our legal team gives each of our clients individualized attention, so you don’t feel like just a number, and our aggressive negotiation tactics work to maximize your compensation.

As the nation’s largest personal injury law firm, we have the size, resources, and reputation it takes to get the job done. We’ve successfully fought Big Pharma before, and we won’t back down from Eli Lilly.

Can I Join the Lawsuit If I Was Prescribed Mounjaro for Weight Loss Only?

Yes. While Mounjaro was originally approved for type 2 diabetes, many patients were prescribed the drug off-label for weight loss—and still suffered from serious side effects.

In legal terms, it doesn’t matter whether you were prescribed the drug for its FDA-approved use or not. If the drug caused you harm, you may still have a valid claim.

Are Mounjaro and Ozempic Lawsuits Being Consolidated?

Currently, Mounjaro and Ozempic lawsuits are being filed separately, but there is a growing push for multidistrict litigation (MDL) that could consolidate cases involving multiple GLP-1 agonists. Courts may decide to group them based on common defendants (like Novo Nordisk or Eli Lilly) or treat them as separate cases by specific side effects (e.g., gastroparesis vs. gallbladder disease).

Our legal team is tracking these developments closely to protect your interests.

How Long Do I Have to File a Claim for Mounjaro Side Effects?

Every state has a different statute of limitations, typically ranging from 1 to 3 years from the date you were injured or discovered (or should have discovered) the injury was related to Mounjaro.

Don’t delay. Even if you’re unsure whether you qualify, it’s best to get a free consultation now before critical deadlines pass.

Ready to Fight Back? Let Morgan & Morgan Help.

Morgan & Morgan is America’s largest injury law firm, with a proven track record in holding pharmaceutical companies accountable. We’ve recovered over $25 billion for our clients, and we don’t charge you anything unless we win your case. That’s right—the Fee Is Free®, and we only get paid if you win.

If you or a loved one has suffered from gastroparesis, bowel obstruction, or another severe side effect after taking Mounjaro, you may be eligible for significant compensation. Contact Morgan & Morgan today for a free case evaluation to learn more about your legal options.