Meilleur v. Horizon Therapeutics USA, Inc.

CourtDistrict Court, N.D. Illinois
DecidedJanuary 10, 2025
Docket1:23-cv-15501
StatusUnknown

This text of Meilleur v. Horizon Therapeutics USA, Inc. (Meilleur v. Horizon Therapeutics USA, Inc.) is published on Counsel Stack Legal Research, covering District Court, N.D. Illinois primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Meilleur v. Horizon Therapeutics USA, Inc., (N.D. Ill. 2025).

Opinion

UNITED STATES DISTRICT COURT FOR THE NORTHERN DISTRICT OF ILLINOIS EASTERN DIVISION IN RE: TEPEZZA MARKETING, SALES PRACTICES, AND PRODUCTS LIABILITY No. 23 C 3568 LITIGATION MDL No. 3079

Judge Thomas M. Durkin

MEMORANDUM OPINION AND ORDER Presently before the Court is multidistrict litigation arising out of hearing- related injuries allegedly caused by the use of the drug TEPEZZA®. Defendant Horizon Therapeutics USA, Inc. filed four motions to dismiss the bellwether discovery cases. The Court granted one of those motions and dismissed Plaintiff Merriweather’s complaint on choice-of-law grounds. Plaintiff Kanesta-Rychner also filed a motion for leave to amend her complaint. For the following reasons, the motion to dismiss the failure-to-warn claims is denied; the motion to dismiss the design defect claims is granted; the motion to dismiss the fraudulent misrepresentation claims is granted in part, denied in part, and continued in part; and Kanesta-Rychner’s motion for leave to file a second amended complaint is denied. Background I. Overview Thyroid eye disease (“TED”) is a condition characterized by inflammation of the tissue around the eyes. Chryssos v. Horizon Therapeutics USA, Inc., No. 1:23-cv- 03033 (N.D. Ill. Feb. 29, 2024), ECF No. 12 ¶ 28.1 Symptoms can vary greatly from one person to another, and range from mild to severe. Id. ¶ 31. The most noticeable symptom is exophthalmos or proptosis, which refers to the bulging or protrusion of

the eyes out of the eye socket. Id. Other symptoms include redness, irritation, discomfort, eyelid retraction or swelling, blurred or double vision, chronic bloody eyes, watery eyes, intolerance to bright lights, and difficulty moving the eyeballs. Id. TEPEZZA® or teprotumumab (“Tepezza”) is a medication used to treat TED. Id. ¶ 42. Tepezza acts by inhibiting the activity of the protein insulin-like growth factor-1 receptor (“IGF-1R”). Id. ¶¶ 46, 103. The FDA granted Tepezza “Orphan Drug”

designation in 2013, “Fast Track” designation in 2015, and “Breakthrough” designation in 2016. Id. ¶¶ 37–40. Defendant Horizon Therapeutics USA, Inc. (“Horizon”), the pharmaceutical company involved in the manufacture, research, development, marketing, distribution, and sale of Tepezza, submitted the Biologic License Application (“BLA”) for the drug in July 2019. Id. ¶¶ 19–20. In January 2020, the FDA approved Tepezza, making it the first approved drug indicated to treat TED. Id. ¶ 42.

The plaintiffs in this action were prescribed Tepezza to treat their TED, and received the drug through a series of intravenous infusions. Id. ¶ 10. They allege that Tepezza caused them to suffer permanent hearing loss and/or tinnitus. Id. ¶¶ 11, 12. They claim that Horizon failed to adequately warn physicians and consumers about

1 The parties cite to Plaintiff Chryssos’ First Amended Complaint (“FAC”), which is representative of the FACs of all bellwether discovery plaintiffs. The Court adopts the same approach and cites the complaint as “FAC.” the risks of hearing-related injuries, that Tepezza was defectively designed, and that Horizon fraudulently misrepresented the safety and efficacy of Tepezza. II. Label

FDA regulations set forth the required content and format of labeling for prescription drug and biologic products. The sections of the label include but are not limited to: Highlights of Prescribing Information; Warnings and Precautions (Section 5); Adverse Reactions (Section 6); Patient Counseling Information (Section 17). At a high level, the Warnings and Precautions section describes “clinically significant adverse reactions,” while the Adverse Reactions section describes “the overall adverse

reaction profile of the drug.” 21 C.F.R. § 201.57(6), (7). An adverse reaction is “an undesirable effect, reasonably associated with use of a drug, that may occur as part of the pharmacological action of the drug or may be unpredictable in its occurrence.” 21 C.F.R. § 201.57(7). The Adverse Reactions section contains subsections for Clinical Trials Experience, which lists the adverse reactions that are identified in clinical trials, and Postmarketing Experience, which lists adverse reactions that are identified from “domestic and foreign spontaneous reports.” Id.

At its approval in January 2020, Tepezza’s label included two references to hearing impairment: - Within the Adverse Reactions section, the Clinical Trials Experience subsection noted that 10% of participants in two clinical studies experienced “[h]earing impairment (includes deafness, eustachian tube dysfunction, hyperacusis, hypoacusis2 and autophony).”

2 Hyperacusis is defined as abnormally acute hearing, while hypoacusis is defined as the partial loss of hearing. Hyperacusis, Merriam-Webster Dictionary, - Within the Highlights of Prescribing Information section, the Adverse Reactions subsection listed “hearing impairment” as one of the “[m]ost common adverse reactions (incidence greater than 5%).” FAC ¶¶ 52, 67, 267; R. 178-2. On January 20, 2023, Horizon submitted a supplemental BLA, proposing the following additions to the label: - Within the Warnings and Precautions section, that Tepezza may cause “transient, or rarely permanent, hearing impairment or loss” based upon “post marketing reports received of cases with a higher level of severity compared to cases from clinical trial experience.” - Within the Adverse Reactions section, “hearing impairment” to the introductory language, tinnitus to the Clinical Trials Experience subsection; and severe hearing impairment or loss to the Postmarketing Experience subsection. - Within the Patient Counseling Information section, “advise patients that [Tepezza] may cause transient or, rarely, permanent hearing impairment or loss.” FAC ¶¶ 118–19. In July 2023, the FDA approved a new label, adding: - Within the Warnings and Precautions section, a subsection titled “Hearing Impairment Including Hearing Loss,” which states that Tepezza “may cause severe hearing impairment including hearing loss, which in some cases may be permanent” and an instruction to assess patients’ hearing “before, during, and after treatment with” Tepezza and “consider the benefit-risk of treatment.” - Within the Adverse Reactions section, “Hearing Impairment Including Hearing Loss” and in the Postmarketing Experience subsection, “Otologic: severe hearing impairment including hearing loss, which in some cases may be permanent.” - Within the Patient Counseling Information section, “Advise patients that [Tepezza] may cause severe hearing impairment including hearing loss, which in some cases may be permanent. Instruct patients to contact their healthcare provider if they experience any signs or symptoms of hearing impairment or any changes in hearing.”

https://www.merriam-webster.com/medical/hyperacusis; Hypoacusis, Merriam- Webster Dictionary, https://www.merriam-webster.com/medical/hypoacusis. - Within the Highlights of Prescribing Information, “Hearing Impairment Including Hearing Loss” under “Recent Major Changes” and the new language under “Warnings and Precautions.” Id. ¶ 140; R. 178-4. Additionally, within the Clinical Trials Experience subsection of the Adverse Reactions section, the description of hearing-related adverse reactions now reads, “Hearing impairment including hearing loss (deafness, including sensorineural deafness, eustachian tube dysfunction, hyperacusis, hypoacusis, autophony and tinnitus).” R. 178-4. III. Procedural History In June 2023, the Judicial Panel on Multidistrict Litigation centralized numerous cases into the Tepezza MDL. On November 3, 2023, the Court dismissed

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