What Is Oxbryta, and Why Did Pfizer Pull It from the Market?
Oxbryta (voxelotor) is a sickle cell disease medication manufactured by Pfizer after the company acquired the original manufacturer, Global Blood Therapeutics, for $5.4 billion in 2022. The FDA granted voxelotor accelerated approval in 2019 as the first drug designed to directly target the underlying cause of sickle cell disease by preventing red blood cells from sickling.
Here's what makes Oxbryta's story so disturbing:
- Accelerated approval: The FDA approved Oxbryta based on limited data showing that it increased hemoglobin levels rather than proven clinical benefits.
- Hidden mortality risks: Post-marketing studies revealed that patients taking Oxbryta died at higher rates than those on standard care.
- Increased crisis rates: The drug meant to prevent vaso-occlusive crises actually appeared to cause more frequent and severe episodes.
- Global withdrawal: Pfizer voluntarily pulled Oxbryta from the worldwide market in September 2024 following concerns from the FDA and the European Medicines Agency.
Patients trusted this medication because they desperately needed hope for their sickle cell disease. In turn, Pfizer collected billions while their drug made patients sicker.
The Science Behind Oxbryta's Fatal Failure

Critical post-marketing studies revealed that Oxbryta didn't just fail to help patients — it may have been actively harming them. The evidence included documented clinical data that Pfizer can't dispute.
Pfizer's Own Study Results
The pharmaceutical giant's required post-marketing surveillance study, which was designed to confirm Oxbryta's benefits, instead revealed alarming safety warnings. Higher death rates among Oxbryta patients compared to those receiving standard care forced Pfizer to halt the study early and withdraw the drug globally.
EMA Investigation
A comprehensive safety review from the European Medicines Agency found that Oxbryta failed to demonstrate clinical benefit while potentially increasing mortality risk. The agency’s analysis of available data showed that the drug's risks outweighed its potential benefits, leading to immediate suspension across Europe.
FDA Response
Despite initially approving Oxbryta through its accelerated pathway, the FDA was ultimately forced to allow Pfizer's voluntary withdrawal after mounting evidence of harm. In a statement released on September 26, 2024, the agency confirmed the drug's unfavorable benefit-risk profile.
This wasn't a precautionary measure. It was damage control after Pfizer's $5.4 billion gamble put sickle cell patients at extreme risk.
Understanding Sickle Cell Disease and Vaso-Occlusive Crises
Sickle cell disease is a hereditary blood disorder affecting approximately 100,000 Americans, primarily those of African descent. The condition causes red blood cells to become crescent or "sickle" shaped, leading to various adverse health outcomes, including vaso-occlusive crisis.
Here’s what happens during a vaso-occlusive crisis:
- Blood vessel blockage occurs when sickled cells clump together and obstruct blood flow.
- Severe pain episodes can last hours or days and require hospitalization.
- Tissue and organ damage can result from a lack of oxygen and nutrients.
- Life-threatening complications, including stroke, acute chest syndrome, and organ failure, are possible.
How Oxbryta Was Supposed to Help
Pfizer marketed Oxbryta as a breakthrough that would:
- Prevent red blood cells from sickling by increasing hemoglobin levels
- Reduce the frequency and severity of vaso-occlusive crises
- Improve quality of life for sickle cell patients
- Provide the first targeted therapy for the disease's root cause
Instead, post-marketing data indicated that Oxbryta patients experienced more frequent crises and higher mortality rates than those on standard treatments.
The Oxbryta Recall Timeline: Pfizer's Billion-Dollar Bust

- 2019: FDA grants accelerated approval to Oxbryta based on laboratory markers, not clinical outcomes.
- 2022: Pfizer acquires Oxbryta's developer, Global Blood Therapeutics, for $5.4 billion, betting on the drug's commercial success.
- 2023–2024: Required post-marketing studies begin showing concerning safety signals.
- August 2024: European Medicines Agency suspends Oxbryta marketing authorization.
- September 2024: Pfizer voluntarily withdraws Oxbryta from all global markets, citing "unfavorable benefit-risk profile”.
- October 2024: First lawsuits filed against Pfizer as patients realize they may have been harmed.
This series of events reveals Pfizer's fundamental failure: The company had spent years touting a drug that may have been harming the exact patients it was supposed to help.
Who Can File an Oxbryta Lawsuit?
You may have a valid legal claim if the following facts apply to your situation:
- You took Oxbryta for sickle cell disease treatment for any period of time.
- You experienced worsening sickle cell symptoms while on Oxbryta, including more frequent or severe vaso-occlusive crises.
- You suffered serious complications such as stroke, organ damage, or acute chest syndrome.
- You required increased hospitalizations or medical interventions while taking Oxbryta.
- You lost a loved one who was taking Oxbryta.
The duration and timing of your Oxbryta use matter for your case. However, regardless of whether you took the drug for months or years, if you experienced worsening symptoms or complications while on voxelotor, you may be entitled to significant compensation.
What If I'm Not Sure My Problems Are Related to Oxbryta?
Many patients don't immediately connect their worsening symptoms to a medication they were told would help them. That's understandable, and we can help you investigate to confirm the connection. Our investigation might involve working with sickle cell specialists who understand how Oxbryta may have worsened your condition.
Current Oxbryta Litigation Status

Oxbryta litigation is rapidly developing, with cases being filed against Pfizer in federal courts across the country. Legal teams expect these cases to be consolidated into multidistrict litigation (MDL) to handle common issues efficiently.
What to Expect During Oxbryta Litigation
The legal work required for your case will focus on proving the following:
- Whether Oxbryta caused increased mortality and morbidity in sickle cell patients.
- What Pfizer knew about safety risks during development and post-marketing surveillance.
- Whether the company adequately warned doctors and patients about the potential dangers.
- How much compensation victims deserve for their worsening condition and medical expenses.
Early bellwether trials are anticipated in 2025–2026. These test cases will help establish liability details and compensation ranges while potentially leading to broader settlement discussions. Filing your claim now will ensure that you're positioned to act on these critical developments.
Compensation Available for Oxbryta Injuries
While every case is unique, Oxbryta victims may be able to recover compensation for:
- Additional medical expenses from increased hospitalizations and treatments
- Lost wages from worsening health and increased sick days
- Pain and suffering from more frequent and severe vaso-occlusive crises
- Reduced quality of life from declining health after trusting the medication
- Future medical costs for ongoing treatment for sickle cell complications
- Punitive damages for Pfizer's reckless marketing of a dangerous drug to vulnerable patients
- Wrongful death damages (for families who lost loved ones while on Oxbryta)
Understanding the Value of Your Claim
Several factors can affect your prospective compensation, including:
- Duration of use: Longer exposure may correlate with more severe complications.
- Severity of related symptoms: Increased hospitalization frequency and complications merit greater damages.
- Age and life expectancy: Younger patients may face decades of dealing with worsening sickle cell disease.
- Impact on daily functioning: Some patients may no longer be able to work or maintain their independence.
- Medical expenses: Emergency room visits and extended hospital stays are costly.
Our capable legal team will fight for compensation that reflects the full scope of Oxbryta’s effects on your life, not just your immediate medical bills.
How CohenMalad Can Help Your Oxbryta Case

We aren't a settlement mill. With more than 55 years of trial experience and attorneys who have secured major victories against pharmaceutical companies, we're a trusted law firm built to take on corporate giants like Pfizer.
Here's what you can expect when you entrust your claim to us:
- Free, thorough case evaluation to determine whether you have a strong claim.
- Comprehensive investigation into your Oxbryta use, medical history, and symptom progression.
- Collaboration with sickle cell specialists who understand how Oxbryta may have worsened your condition.
- Aggressive pursuit of comprehensive compensation for your injuries and ongoing medical needs.
- Trial-ready preparation in case your claim goes to court.
Pharmaceutical companies have teams of lawyers and nearly unlimited funds at their disposal. If you've been harmed by Oxbryta, you need a legal team that won't be intimidated by Pfizer's resources and influence.
Our Track Record Against Big Pharma
CohenMalad, LLP, has successfully taken on numerous pharmaceutical companies in cases involving:
- Dangerous medications that caused unexpected side effects and complications.
- Defective medical devices that harmed patients rather than helping them.
- Corporate cover-ups where companies concealed known risks from patients and doctors.
- Mass tort litigation affecting thousands of patients nationwide.
We understand the pharmaceutical companies’ legal playbook and know how to beat them in courtrooms across the country.
The Legal Process for Your Oxbryta Lawsuit
If you decide to file a legal claim after being negatively impacted by Oxbryta, here’s how you can expect the process to unfold:
Time Limits for Filing Your Oxbryta Lawsuit

There's a limited window to file a lawsuit for Oxbryta injuries. Each state has its own statute of limitations, typically two to three years from the time you discovered (or should have discovered) that Oxbryta caused your worsening condition.
Here’s why timing is critical:
- Evidence preservation becomes more difficult as time passes.
- Medical records may be destroyed after certain time periods.
- Witness availability decreases, and memories fade over time.
- Missing the deadline means losing your right to pursue compensation forever.
The discovery rule may help. Since most patients didn't know Oxbryta could worsen their condition until the September 2024 withdrawal, the statute of limitations clock may not start until then.
Don't risk being denied rightful compensation due to timing issues. Contact us today for a free evaluation of your claim and the filing deadline.

Find Out If You Qualify for Compensation
Don't face Pfizer's legal team alone. If you've suffered worsening sickle cell symptoms after taking Oxbryta, CohenMalad, LLP, is here to fight for you.
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