For decades, millions of women trusted Depo-Provera as a safe and effective form of birth control. But a growing body of scientific evidence—some of it dating back more than 40 years—suggests that Pfizer may have had reason to investigate a serious health risk long before patients were ever warned. Today, thousands of women who developed meningioma brain tumors are filing lawsuits against the drug manufacturer for failing to warn patients and doctors about the potential link between Depo-Provera and brain tumor development.
What Responsibility Do Pharmaceutical Companies Have to Disclose Known Risks?
In the United States, pharmaceutical companies have a legal duty to warn both patients and healthcare providers about known or reasonably foreseeable risks associated with their products. This obligation exists whenever a manufacturer knows, or reasonably should know, that its drug may cause harm. Drug makers are expected to stay current with evolving scientific research and to update their product labeling accordingly. When a company fails to provide adequate warnings, it can be held liable for injuries that result from that failure.
Early Scientific Research Linked Progesterone to Meningioma Risk
In 1983, researchers found that meningioma tumor cells contain a high concentration of progesterone receptors. This research demonstrated that progesterone, the hormone that forms the basis of Depo-Provera, could actively stimulate the growth of these brain tumors.
A study in the European Journal of Cancer confirmed the presence of progesterone receptors in meningioma cells. These findings suggested that progesterone is a potentially significant factor in how frequently meningiomas develop, how they behave, and how rapidly they progress.
Subsequent research showed that antiprogesterone medications could be used to treat these tumors, another piece of evidence tying progesterone exposure to meningioma development. Pfizer had every reason to investigate whether its product could cause brain tumors, given that the scientific evidence was publicly available as early as 1983— nearly a decade before Depo-Provera received FDA approval as a contraceptive in 1992.
The Dangers of Meningiomas for Depo-Provera Patients
Meningiomas are tumors that develop in the tissue surrounding the brain and spinal cord. Most meningiomas are benign, or non-cancerous, but they can still cause serious and sometimes life-altering complications depending on their size and location.
These complications may include:
- Severe headaches
- Vision problems or vision loss
- Seizures
- Hearing loss
- Memory and cognitive difficulties
- Balance issues or dizziness
Treatment for meningioma often involves invasive brain surgery, radiation therapy, and long-term medical monitoring. Many women who have undergone these procedures face permanent disabilities and ongoing neurological challenges.
Did Pfizer Warn Patients and Doctors About These Findings?
Despite the research connecting progesterone to meningioma risk, Pfizer did not include warnings about brain tumors on Depo-Provera labels in the United States for decades. Other countries acted well before the United States did; in 2022, both the European Medicines Agency and Health Canada required Pfizer to add meningioma warnings to Depo-Provera’s labeling. South Africa’s drug regulatory agency followed suit with a similar recommendation in January 2025.
But in the United States, the FDA did not approve a label change until December 2025, more than 40 years after the initial scientific evidence emerged. Because of this decades-long gap between available knowledge and an official warning, thousands of women may have been unnecessarily exposed to the risk of developing cerebral brain tumors.
Lawsuits Filed Against Pfizer Accuse the Company of Failure to Warn
As of early 2026, thousands of lawsuits have been filed against Pfizer by women who have developed cerebral meningioma brain tumors following their use of Depo-Provera. These cases have been consolidated into a federal multidistrict litigation (MDL) in the U.S. District Court for the Northern District of Florida.
Recent studies have also established a link between Depo-Provera and meningioma development. A 2024 study published in the British Medical Journal found that women who used this contraceptive for more than one year were 5.5 times more likely to develop meningioma compared to women who did not use the contraceptive. A 2025 study in JAMA Neurology found that the drug doubled the risk of meningioma, with the highest risk observed in women who began using it after age 31 or who had received injections for four or more years.
Who Is Eligible to File a Depo-Provera Lawsuit Against Pfizer?
You may be eligible to file a Depo-Provera lawsuit and pursue compensation if you meet the following criteria:
- You used Depo-Provera or an authorized generic version.
- You received at least one year of treatment.
- You were diagnosed with a meningioma brain tumor.
If you begin experiencing symptoms of a meningioma, such as persistent headaches, changes in vision, seizures, or difficulties with memory and balance, seek medical attention as soon as possible. Document all of your medical records, treatment history, and Depo-Provera injection dates, and follow your doctor’s recommended treatment plan. Then, contact a Depo-Provera lawsuit attorney who can evaluate your case and help protect your legal rights.
What Damages Are Plaintiffs Seeking in Depo-Provera Claims?
The purpose of a Depo-Provera lawsuit is to hold Pfizer accountable for the harm caused by its alleged failure to warn patients about the risk of meningioma brain tumors. By filing a claim, you can seek financial compensation for the losses and suffering you have endured as a result of your diagnosis.
These damages are typically divided into two categories: economic damages, which cover measurable financial losses, and non-economic damages, which address the personal toll of your injuries:
- Economic damages may include medical expenses such as brain surgery, radiation therapy, hospital stays, and ongoing monitoring. You can also recover damages for lost wages and diminished earnings if your condition has kept you from working.
- Non-economic damages, often referred to as pain and suffering, reflect the ways your diagnosis has affected your quality of life. This includes the physical pain of treatment and recovery, the emotional distress of facing a brain tumor diagnosis, and the impact on your daily life and relationships.
Find Out if You Qualify for a Depo-Provera Lawsuit
Scientific evidence suggests that the risks associated with Depo-Provera were documented decades ago. You deserved to know about these dangers before making such an important decision about your health.
Shapiro Legal Group, PLLC fights for women harmed by dangerous pharmaceutical products nationwide, and we can help you pursue the compensation you deserve. If you were diagnosed with a meningioma after taking this medication, seek medical attention and ensure your condition is fully documented. Then, contact our Depo-Provera lawsuit attorneys at (800) 220-0984 for a free, confidential consultation.