Paraquat Parkinson's Disease Lawsuit
This MDL consolidates lawsuits against Syngenta, Chevron, and other manufacturers alleging that exposure to paraquat herbicide causes Parkinson's disease. Paraquat is banned in over 30 countries including the EU but remains legal in the United States.
Key Takeaways
- Paraquat is one of the most acutely toxic herbicides in widespread use—one sip can be fatal
- Research shows paraquat exposure associated with 2.5x increased Parkinson's risk (Tanner 2011 study)
- Paraquat is banned in 30+ countries including the EU, China, and Brazil—but still legal in the US
- Only certified pesticide applicators may use paraquat—no home or consumer products exist
- The EPA has NOT required Parkinson's disease warnings on paraquat labels
Key Facts (May 2026)
| Pending Lawsuits | 6,580 cases in federal MDL |
| Disease Alleged | Parkinson's Disease |
| Primary Defendants | Syngenta, Chevron, Chevron Phillips |
| Lead Product | Gramoxone (paraquat dichloride) |
| EPA Classification | Restricted Use Pesticide (RUP) |
| Who Can Apply | Certified applicators only—no consumer use |
| EU Status | Banned since 2007 |
| Presiding Judge | Chief Judge Nancy J. Rosenstengel |
| Court | S.D. Illinois (East St. Louis) |
| Can You Still File? | Yes, lawsuits are being filed |
Steady Case Growth in 2025
One of the largest environmental product liability MDLs in federal court. Cases continue to be filed as agricultural workers link their Parkinson's disease to paraquat exposure. Case count has grown 13% since January 2025.
Source: JPML MDL Statistics Reports, January 2025-May 2026
1 What Is This Lawsuit?
The Paraquat MDL consolidates lawsuits from agricultural workers, farmers, and others who developed Parkinson's disease after exposure to paraquat dichloride, a highly toxic herbicide sold primarily under the brand name Gramoxone.
The Core Allegation
Plaintiffs allege that Syngenta and other manufacturers knew or should have known that paraquat exposure increases the risk of Parkinson's disease, but failed to warn users. Labels contain no neurological warnings despite decades of research linking paraquat to PD.
Why It Matters
Unlike many pesticides, paraquat is so toxic it's classified as a Restricted Use Pesticide—only certified applicators can use it. Yet even with proper protective equipment, chronic exposure may lead to irreversible neurological damage.
Claims typically include failure to warn, design defect, negligence, and fraud or concealment. Plaintiffs argue that adequate warnings could have prompted them to take additional precautions or avoid paraquat entirely.
2 What Is Paraquat?
Extreme Acute Toxicity
According to the CDC, paraquat is one of the most acutely toxic herbicides still in use. One small sip can be fatal, and there is no antidote. The chemical causes 1-2 deaths per year in the US from accidental ingestion.
Paraquat dichloride is a broad-spectrum herbicide and desiccant used primarily in commercial agriculture for weed control and pre-harvest crop drying (especially cotton). It kills plants through contact action by disrupting photosynthesis and generating cell-destroying free radicals.
Who Uses Paraquat?
3 The Parkinson's Disease Connection
Parkinson's disease is a progressive movement disorder caused by the death of dopamine-producing neurons in the brain's substantia nigra. By the time symptoms appear, patients have typically lost 60-80% of these critical neurons.
Key Research: Tanner 2011 Study
| Study | Agricultural Health Study (AHS) |
| Published | Environmental Health Perspectives, 2011 |
| Finding | Paraquat associated with 2.5x increased PD risk (OR 2.5, 95% CI: 1.4-4.7) |
| Sample | 89,000+ farmers and spouses followed since 1993 |
How Paraquat May Cause Parkinson's
Oxidative Stress
Paraquat generates reactive oxygen species (free radicals) through redox cycling. This oxidative stress damages cellular components and may selectively harm dopaminergic neurons.
MPP+ Similarity
Paraquat's structure is similar to MPP+, a known neurotoxin that causes parkinsonism. This structural similarity supports biological plausibility for the paraquat-PD connection.
Scientific Debate
While the 2011 Tanner study found a significant association, a 2020 AHS update did not replicate these findings. The EPA states it has "not found a clear link" between paraquat and Parkinson's, though plaintiffs argue the weight of evidence supports causation. The NTP identified paraquat as a potential candidate for systematic review regarding PD.
4 Banned Worldwide—But Not in the US
A central issue in the litigation is that paraquat has been banned in dozens of countries due to safety concerns, yet remains legal in the United States.
Banned Countries
- European Union (2007)
- China (2016)
- Brazil (2020)
- Thailand (2020)
- Switzerland
- 32+ other countries
Still Approved
- United States
- Australia (with restrictions)
- Some African, Asian, Latin American countries
The EU Ban (2007)
The European Union banned paraquat in 2007 via Commission Decision 2007/442/EC. The decision cited the inability to establish safe use standards protecting operators and bystanders. The EU concluded that risks to human health could not be adequately managed.
5 The Warning Issue
What Labels DO Include
- DANGER/POISON signal words
- "ONE SIP CAN KILL" warnings
- Extensive PPE requirements
- Acute poisoning first aid
What Labels DON'T Include
- Parkinson's disease risk warning
- Neurological effects warnings
- Long-term chronic exposure risks
- Brain or nervous system warnings
This is a central issue in the litigation. Plaintiffs argue that while labels warn extensively about acute poisoning, they say nothing about the risk of developing Parkinson's disease from chronic occupational exposure—even though research has linked paraquat to PD for decades.
6 Who May Qualify
You may be eligible to file a lawsuit if you meet these criteria:
History of Paraquat Exposure
Worked as a certified applicator, farmer, farmworker, mixer/loader, or aerial applicator who handled paraquat (Gramoxone, etc.)
Parkinson's Disease Diagnosis
Diagnosed with Parkinson's disease or parkinsonism by a qualified physician
OR Proximity Exposure
Lived or worked near agricultural areas where paraquat was regularly applied (drift exposure)
7 How Is This Different From Roundup?
| Factor | Paraquat (MDL-3004) | Roundup (MDL-2741) |
|---|---|---|
| Disease Alleged | Parkinson's Disease | Non-Hodgkin Lymphoma |
| User Base | Certified applicators only | Includes home/consumer users |
| Settlements | No major settlements yet | Bayer settled $10B+ |
| International Status | Banned in 30+ countries | Limited restrictions |
| IARC Classification | Not classified | Group 2A (Probably carcinogenic) |
8 Frequently Asked Questions
Is paraquat the same as Roundup?
Can I use paraquat at home?
Why is paraquat still legal in the US if it's banned elsewhere?
What are the symptoms of Parkinson's disease?
Have there been any verdicts or settlements?
Is it too late to file a lawsuit?
Sources & References
7 sources citedJudicial Panel on Multidistrict Litigation (JPML) — Official MDL statistics
EPA Paraquat Dichloride Page — Regulatory information and position
CDC Paraquat Fact Sheet — Toxicity and safety information
Tanner et al. 2011 — Environmental Health Perspectives study (PMID: 21269927)
NINDS Parkinson's Disease — National Institute of Neurological Disorders
EU Decision 2007/442/EC — European Union paraquat ban
Court records and JPML case statistics. Data current as of May 2026.
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