History of Depo-Provera and Lawsuits Against Depo-Provera Manufacturers [2025 Guide]

The Developmental, Regulatory, and Medical History of Depo-Provera

Depo-Provera (medroxyprogesterone acetate) is a long-acting progestin contraceptive injection developed by Upjohn, a pharmaceutical company that later became part of Pfizer.

Originally formulated in the 1950s, medroxyprogesterone acetate was initially studied for potential use in treating endometrial and renal cancers due to its anti-proliferative effects on hormone-sensitive tissues.

However, researchers quickly recognized its ability to suppress ovulation and prevent pregnancy by inhibiting gonadotropin secretion, leading Upjohn to explore its use as a contraceptive.

Upjohn first sought U.S. Food and Drug Administration (FDA) approval for Depo-Provera as a contraceptive in the late 1960s, but the request was denied due to concerns about potential long-term health risks.

The primary reason for rejection was animal studies showing a link between medroxyprogesterone acetate and an increased risk of breast and endometrial cancers.

Despite these concerns, Depo-Provera gained approval in several international markets, including France in 1969 and later in developing countries, where it was widely promoted for population control efforts.

1992: U.S. Food and Drug Administration Approval

Upjohn continued pushing for U.S. approval throughout the 1970s, filing additional applications with the FDA in 1978 and 1983.

Each time, the FDA rejected the drug due to safety concerns, particularly over its potential carcinogenic effects and the risk of bone density loss.

However, in 1992—under mounting pressure from global health organizations and with additional safety studies in hand—the FDA finally approved Depo-Provera as an injectable contraceptive in the U.S.

The approval was controversial, as lingering concerns remained regarding its long-term safety profile, particularly for younger women who might use the drug for extended periods.

Medical Use and Long-Term Safety Concerns of Receiving Depo-Provera Injections

Depo-Provera became widely used due to its effectiveness and convenience, requiring only one injection every three months to prevent pregnancy.

By the early 2000s, millions of women worldwide were using Depo-Provera, with many health providers prescribing it as a first-line contraceptive option.

However, post-market surveillance studies and long-term clinical research began raising concerns about the drug’s safety.

In particular, studies linked Depo-Provera to significant bone mineral density loss, leading the FDA to issue a black box warning in 2004 cautioning against prolonged use beyond two years.

Further concerns emerged regarding its neurological and endocrine effects, particularly its influence on progesterone receptors in the brain.

While the drug was primarily marketed for contraception, it was also prescribed off-label for conditions such as endometriosis and menstrual suppression.

However, scientific research began drawing attention to the potential for high-dose progestins, like medroxyprogesterone acetate, to contribute to abnormal cell growth in hormone-sensitive tissues—including the meninges, the protective membranes surrounding the brain and spinal cord.

2024 Scientific Study: Depo-Provera Users at Increased Risk of Developing Brain Tumors

A groundbreaking study published in The British Medical Journal (BMJ) in March 2024 has revealed compelling evidence that prolonged Depo-Provera usage significantly increases the risk of developing intracranial meningiomas—tumors that form on the protective membranes surrounding the brain and spinal cord.

This study is one of the most comprehensive investigations to date examining the correlation between synthetic progestins and meningioma development, providing a statistical risk assessment that has fueled growing legal scrutiny and regulatory concerns surrounding Depo-Provera.

The BMJ study analyzed extensive patient data sourced from the French National Health Data System, a robust and centralized database tracking medical histories, prescription records, and health outcomes.

Researchers identified over 18,000 cases of women who had undergone surgery for meningiomas and compared their medical records with 90,000 control subjects to assess differences in contraceptive use.

The study focused specifically on women who had used synthetic progestins, including medroxyprogesterone acetate (MPA), the active ingredient in Depo-Provera.

Key risk factors—including age, duration of contraceptive use, and cumulative exposure to high-dose progestins—were carefully analyzed.

The findings demonstrated a direct dose-response relationship between prolonged Depo-Provera use and an increased likelihood of developing meningiomas, meaning that the longer a woman used the Depo shot, the higher her risk of developing a brain tumor.

Key Findings from the 2024 BMJ Study:

• A 550% Increased Risk of Meningiomas: Women who used Depo-Provera were 5.5 times more likely to develop an intracranial meningioma compared to non-users. This odds ratio (OR) of 5.55 is among the highest risk correlations seen in pharmaceutical litigation.
• Long-Term Use Raises Risk Significantly: The study found that prolonged exposure (more than one year) dramatically increased tumor development, with even greater risk for women who had used Depo-Provera for several years.
• Strong Association with High-Dose Progestins: While other hormonal contraceptives were examined, the study found that medroxyprogesterone acetate posed the highest risk due to its potent effect on progesterone receptors in brain tissue.
• Higher Risk for Women Over 40: Older women who had used Depo-Provera were particularly vulnerable to developing large, symptomatic meningiomas requiring invasive treatment, including craniotomies and radiation therapy.
• Confirmed Causal Mechanism: The study reinforced prior biological research showing that meningiomas express progesterone receptors, making them highly susceptible to synthetic progestin stimulation, which can trigger tumor growth.
• Risk Not Present with Other Hormonal IUDs: Unlike Depo-Provera, the study did not find a significantly increased risk among women using intrauterine devices (IUDs) that release progestins in lower doses.
• International Labeling Disparities Highlighted: The study pointed out that Depo-Provera labels in Canada and the European Union already contain warnings about meningioma risk, raising questions about why the U.S. label does not include the same cautionary information.

Legal and Medical Implications of the Study

The BMJ study has sent shockwaves through the medical and legal communities, reinforcing long-held suspicions that Depo-Provera’s high-dose progestin formulation may pose serious health risks.

The 550% increased risk of meningiomas is an alarmingly high statistic that raises concerns about whether Pfizer failed to warn consumers and medical professionals despite mounting evidence of potential harm.

From a legal standpoint, the study provides critical scientific evidence that strengthens the claims of plaintiffs filing Depo-Provera Lawsuits.

The risk ratio is well beyond what is typically required to establish causation in pharmaceutical litigation, meaning that this research will likely play a central role in multidistrict litigation (MDL) proceedings.

On the medical front, this study raises serious concerns about how Depo-Provera should be prescribed moving forward.

Many experts now believe that healthcare providers should reconsider prescribing Depo-Provera for long-term contraception—especially given that Pfizer also manufactures a lower-dose alternative, Depo-SubQ Provera 104, which has not been associated with the same increased brain tumor risk.

Pfizer’s Response and the Need for Further Investigation

Despite the BMJ study’s clear findings, Pfizer has yet to update Depo-Provera’s U.S. labeling to reflect the increased risk of meningiomas.

The company has stated that it is “reviewing emerging data” but has not taken proactive steps to warn consumers or restrict long-term prescribing of the drug.

The results of this study, combined with Pfizer’s failure to act, have bolstered legal arguments for negligence, defective drug design, and failure to warn.

As more lawsuits are filed, plaintiffs will argue that Pfizer prioritized profit over patient safety, failed to provide adequate warnings, and ignored scientific evidence that should have prompted label updates and patient warnings years ago.

The BMJ study will likely be a defining piece of evidence in the Depo-Provera MDL.

Do You Qualify for the Depo-Provera Brain Tumor Lawsuit?

Long-term Depo-Provera usage has been linked to an heightened risk of developing brain tumors.

To qualify for a legal claim, Depo-Provera users must have received multiple injections of the contraceptive shot and later been diagnosed with an intracranial meningioma or another brain tumor.

Most attorneys handling these cases are focusing on women who have had at least two Depo-Provera injections due to the cumulative exposure risks outlined in the 2024 BMJ study.

In addition to a confirmed brain tumor diagnosis, qualifying claimants should have medical records showing their Depo-Provera usage and documentation of their tumor diagnosis, treatment history, and related health complications.

An experienced attorney will review individual medical histories to determine whether a strong case can be built based on duration of use, severity of health effects, and financial damages incurred.

Women who have suffered vision impairment, neurological complications, cognitive issues, or other life-altering effects due to a meningioma diagnosis may have stronger claims for compensation.

Family members of patients who have passed away due to Depo-Provera-related tumors may also be eligible to file a wrongful death lawsuit on behalf of their loved one.

If you or a loved one has developed a brain tumor after using Depo-Provera, contact TorHoerman Law today to discuss your eligibility for the Depo-Provera Lawsuit.

You can also use the chat feature on this page to find out if you qualify for the Depo-Provera Brain Tumor Lawsuit instantly.

Our legal team is actively investigating claims, gathering medical evidence, and fighting for justice on behalf of affected women.

Evidence in a Depo-Provera Lawsuit

Proving that Depo-Provera caused serious health complications requires strong medical and factual evidence.

Women filing claims must provide documentation that connects their use of the contraceptive shot to their brain tumor diagnosis and resulting medical treatment.

This includes records of medical appointments, imaging scans, and any prescribed treatments such as radiation or surgery.

In cases where plaintiffs have developed inoperable brain tumors, long-term monitoring and ongoing care must also be considered as part of the claim.

Additionally, lawsuits seek compensation for medical expenses related to diagnosis, treatment, and any necessary future care.

Gathering the right evidence is crucial for building a strong claim, and our legal team can assist in obtaining the necessary documentation.

Key pieces of evidence in a Depo-Provera Lawsuit include:

• Medical records proving long-term Depo-Provera usage
• Doctor’s notes and prescriptions showing the frequency and duration of Depo-Provera injections
• Brain imaging scans (MRI, CT scans) confirming the presence of meningiomas or other brain tumors
• Records of medical appointments with neurologists, neurosurgeons, or oncologists
• Surgical reports and pathology findings for those who have undergone invasive brain surgery
• Documentation of inoperable brain tumors, including physician statements and treatment plans
• Medical expenses related to treatment, hospital stays, medication, and follow-up care
• Expert medical opinions linking Depo-Provera usage to the diagnosed condition
• Employment and financial records showing lost wages or reduced earning capacity due to health complications
• Personal statements describing symptoms, medical struggles, and the impact on quality of life

Our attorneys will help you gather and retain evidence to build a strong case and pursue the compensation you deserve.

Potential Damages in a Depo-Provera Lawsuit

Damages in a lawsuit refer to the compensation sought by victims for the harm they have suffered due to negligence or misconduct.

In the Depo-Provera Lawsuit, damages cover both economic and non-economic losses tied to the brain tumor linked to prolonged use of the birth control shot.

Plaintiffs who developed meningiomas or other severe health conditions after taking Depo-Provera may be entitled to financial recovery for their medical costs, lost wages, and the lasting impact on their quality of life.

Many of the women pursuing legal action used Depo-Provera as long-term birth control, unaware of the serious risks posed by high-dose progestin exposure.

Beyond the financial strain of treatment, they often experience emotional distress, cognitive impairments, and life-altering physical symptoms.

If successful, Depo-Provera settlements will likely address the full scope of damages, helping victims recover the financial, physical, and emotional losses they have endured.

Damages in a Depo-Provera Lawsuit may include:

• Medical costs for diagnostic testing, brain scans, surgery, radiation, and long-term monitoring
• Future medical expenses related to ongoing treatment, medication, and therapy
• Lost wages and diminished earning capacity due to disability or prolonged medical care
• Pain and suffering caused by debilitating symptoms and invasive procedures
• Emotional distress, including anxiety, depression, and psychological trauma from a brain tumor diagnosis
• Loss of quality of life, particularly for women who face cognitive impairment, vision loss, or chronic neurological issues
• Punitive damages if Pfizer is found to have acted with willful disregard for patient safety
• Loss of consortium for spouses and family members affected by their loved one’s condition

Our attorneys will help calculate the full extent of your damages and fight for maximum compensation to ensure that you receive justice for the harm caused by taking Depo-Provera.

TorHoerman Law: Accepting Clients for the Depo-Provera Lawsuit

For years, Pfizer and other pharmaceutical companies have profited from recommending Depo-Provera as a safe and effective contraceptive, despite growing evidence of serious health risks.

Women who developed intracranial meningiomas and other brain tumors after prolonged use of Depo-Provera are now stepping forward to demand accountability.

At TorHoerman Law, we are committed to representing these victims and fighting for the compensation they deserve.

Our firm understands the life-altering impact that a brain tumor diagnosis can have on your health, financial stability, and overall well-being.

We believe that no one should suffer because a drug manufacturer failed to provide adequate warnings about its product’s risks.

By taking legal action, you can help hold Pfizer accountable and seek justice for the harm caused by recommending Depo-Provera without sufficient safety warnings.

If you or a loved one used Depo-Provera and were later diagnosed with a brain tumor, you may qualify for compensation.

Our legal team will handle every aspect of your case, from gathering medical evidence to negotiating potential Depo-Provera settlements.

Contact TorHoerman Law today for a free consultation to discuss your case and learn more about your legal options.