Tepezza Hearing Loss Lawsuits Surge Against Horizon Therapeutics

Tepezza Hearing
Tepezza Hearing

The surge in Tepezza hearing loss lawsuits against Horizon Therapeutics has cast a spotlight on a growing concern within the pharmaceutical industry. Tepezza, a medication primarily used to treat a rare eye condition, has come under intense scrutiny. This is due to a mounting number of reports linking its usage to hearing loss. 

In this complex legal landscape, individuals who have experienced adverse effects are pursuing legal action against Horizon Therapeutics, the drug’s manufacturer. In this article, we delve into the details of these lawsuits, exploring the allegations, impact, and broader ramifications of this emerging healthcare controversy.

Overview of Tepezza

Tepezza stands as a pioneering medical advancement in the treatment of thyroid eye disease (TED), a condition causing inflammation and swelling behind the eyes. Approved by the U.S. Food and Drug Administration (FDA) in January 2020, Tepezza marked a significant milestone as the first and only drug designed to address TED. 

TED, which often leads to distressing symptoms such as bulging eyes, double vision, pain, redness, and dryness, can escalate to complete vision loss. The drug functions as a monoclonal antibody, targeting the insulin-like growth factor, a protein pivotal in the inflammation and swelling characteristic of TED.

The Legal Examiner notes that before Tepezza’s introduction, treatment options were limited to steroids like prednisone and rituximab. Tepezza’s approval three years ago represented a beacon of hope for patients grappling with the debilitating impacts of TED. Developed by Horizon Therapeutics, a leading global pharmaceutical company, Tepezza offered a novel approach, heralded as a breakthrough in medical science. 

Tepezza-Related Hearing Loss

The escalating number of reported cases regarding hearing loss associated with Tepezza usage has raised serious concerns. Recent studies and patient reports highlighted by JD Supra have unveiled alarming trends. 

Those who have undergone Tepezza treatment face heightened challenges due to these hearing issues. This is particularly distressing considering many who undergo Tepezza treatment already grapple with vision problems.

Research indicates that several patients, previously unaffected by hearing symptoms, developed new or worsening sensorineural hearing loss. Furthermore, some patients experienced a patulous eustachian tube. 

It is a disorder where the channels between the ear, nose, and throat remain unnaturally open, disrupting the normal pressure regulation around the eardrum. Additionally, there were cases of persistent sensorineural hearing loss.

Although a small fraction of patients showed improvement three months after discontinuing the medication, a significant number continued to suffer adverse effects from Tepezza. 

Legal Actions Initiated Against Horizon Therapeutics

The surge in Tepezza hearing loss lawsuit cases began when several patients reported developing hearing loss or tinnitus after taking the drug. In response to the lawsuits, Horizon Therapeutics has denied any wrongdoing and defended the safety of Tepezza. 

TorHoerman Law notes that in June 2023, the U.S. Judicial Panel on Multidistrict Litigation (MDL) consolidated all Tepezza hearing loss lawsuits into a single MDL proceeding. The MDL is a procedural device that allows the court to manage complex litigation involving multiple plaintiffs and defendants more efficiently. An important status conference in the Tepezza MDL is scheduled for October 25, 2023. 

During this conference, Judge Durkin will address electronic discovery protocols and address initial disputes between the parties concerning discovery rules. Electronic discovery is the process of collecting, reviewing, and producing electronic documents and other data that are relevant to a lawsuit. 

The fact that all counsel are mandated to attend the hearing in person indicates its importance in shaping the course of the lawsuit. 

The Tepezza hearing loss lawsuits are still in the early stages, and it is too early to say how they will be resolved. However, the surge in lawsuits and the MDL consolidation suggest that these cases are likely to have a significant impact on Horizon Therapeutics.

Allegations and Claims Against Horizon Therapeutics

In the face of mounting Tepezza hearing loss cases, plaintiffs have leveled specific allegations against Horizon Therapeutics. 

One such case, initiated by New Jersey resident William Jett, accuses Horizon Therapeutics of neglecting to thoroughly investigate Tepezza’s threat to patients’ hearing. Despite clinical study results indicating potential risks, the lawsuit alleges that Horizon failed to inform patients about the risk of ear injury. 

Crain’s Chicago Business notes that these accusations center around product liability. They claim that Tepezza, while heralded as a groundbreaking solution for thyroid eye disease, concealed severe auditory risks from patients.

Future Implications of the Lawsuit

The lawsuits against Horizon Therapeutics hold significant implications for the pharmaceutical industry, drug regulations, and patient safety standards. If these legal battles result in substantial verdicts or settlements, pharmaceutical companies may face heightened scrutiny, impacting research, development, and marketing strategies. 

Regulators could intensify pre- and post-market surveillance, demanding more comprehensive safety data. This, in turn, might lead to stricter drug approval processes. 

For patients, it emphasizes the importance of transparent information dissemination and the necessity of stringent monitoring. This will ensure that medications offer therapeutic benefits and guarantee the utmost safety, redefining the future landscape of drug manufacturing, regulation, and patient care.


The case of Tepezza serves as a poignant reminder of the intricate challenges faced by the pharmaceutical industry, regulatory bodies, and healthcare providers. It emphasizes the pressing need for continuous monitoring of drug safety, rigorous post-approval surveillance, and robust communication channels. This will ensure that patients and medical professionals are well-informed about the risks associated with any medication.

As this legal saga unfolds, it prompts reflection on the broader implications for medical research, drug development, and patient welfare. It underscores the necessity for a vigilant approach that prioritizes patient well-being above all else.

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