Organon Announces Positive Interim Phase 3 Study Results for MIUDELLA, a Hormone-Free, Intrauterine Device (IUD), Through 6 Years of Use to Be Presented at the 2026 Society of Family Planning Annual Meeting

• No new safety signals identified during additional three years of extended use
• Organon holds exclusive global licensing rights to MIUDELLA

JERSEY CITY, N.J.--(BUSINESS WIRE)--Organon (NYSE: OGN), a global healthcare company with a mission to deliver impactful medicines and solutions for a healthier every day, today announced that Sebela Women’s Health will present interim results from an ongoing Phase 3 study evaluating MIUDELLA^®, a hormone-free, copper intrauterine device (IUD), through 6 years of use at the 2026 Society of Family Planning (SFP) Annual Meeting, taking place October 17 to 19, 2026, in San Francisco, California. In June 2026, Organon exclusively licensed global rights to MIUDELLA from Sebela Women’s Health.

The prospective, single-arm Phase 3 study is being conducted by Sebela Women’s Health at 42 sites in the United States to evaluate the efficacy and safety of MIUDELLA through 6 years of use. The 6-year outcomes were evaluated in 465 of 1397 and 592 of 1601 enrolled participants in the evaluable-for-pregnancy and safety populations, respectively. The cumulative 6-year Pearl Index was 0.93 (95% CI, 0.62 to 1.34), and the cumulative Kaplan-Meier pregnancy rate was 3.9% (95% CI, 2.7% to 5.8%) at 6 years. Treatment-emergent adverse events reported through 6 years included heavy menstrual bleeding, dysmenorrhea and pelvic discomfort. Bleeding- and pain-related adverse events leading to study discontinuation were observed in 139 participants (8.7%) in year 1 and 11 participants (1.9%) in year 6.¹ Follow-up in the study is ongoing.

Presentation Details:

Title: Efficacy and Safety of a Novel Hormone-Free Intrauterine Device Over 6 Years: Interim Phase 3 Study Results
Meeting: 2026 Society of Family Planning Annual Meeting
Date: October 17, 2026
Presentation Time and Location: 6 p.m. PT; Exhibit Hall

The U.S. Food and Drug Administration (FDA) accepted for review a supplemental New Drug Application (sNDA) for MIUDELLA for an extended duration of use for up to 6 years, with Prescription Drug User Fee Act (PDUFA) action expected in the second quarter of calendar year 2027.

“These interim Phase 3 results add to the clinical evidence for MIUDELLA and represent an important milestone in the ongoing study,” said Juan Camilo Arjona Ferreira, MD, Head of Research & Development and Chief Medical Officer at Organon. “The findings support the FDA review of the supplemental application as we work toward our ambition of expanding hormone-free contraceptive options.”

“Reaching 6 years of follow-up reflects the continued commitment of the participants, investigators, and study teams involved in this ongoing Phase 3 program,” said Kelly Culwell, MD, Chief Medical Officer and Head of Research and Development at Sebela Women’s Health. “These findings provide valuable long-term data and contribute to the understanding of participant experience over time. We are grateful to everyone who has made this research possible.”

The MIUDELLA label includes a Risk Evaluation and Mitigation Strategy (REMS), which is open for enrollment at www.miudellarems.com. Healthcare providers must complete REMS enrollment prior to ordering and inserting MIUDELLA. Healthcare settings where MIUDELLA is dispensed or inserted must also be enrolled in the program by an Authorized Representative. The purpose of the MIUDELLA REMS is to mitigate the risk of complications due to the improper insertion of MIUDELLA by untrained healthcare providers. Please see Important Safety Information below, including Boxed Warning.

About the Ongoing Phase 3 Study of MIUDELLA

The ongoing Phase 3 study is a prospective, single-arm trial evaluating the efficacy and safety of MIUDELLA in females aged 17 to 45 years across 42 United States sites. The current interim analysis includes outcomes through 6 years of use, with follow-up continuing.

About MIUDELLA

MIUDELLA is a hormone-free, low-dose copper intrauterine device (IUD) indicated for the prevention of pregnancy in females of reproductive potential for up to 3 years.² Sebela Women’s Health developed MIUDELLA with three clinical trials in the United States in 1,904 women aged 17 to 45 years.² The Phase 3 prospective, multicenter, single-arm, open-label study was conducted in 42 centers in the United States with a primary endpoint of contraceptive efficacy through 3 years of use as assessed by the Pearl Index (defined as the number of pregnancies per 100 women over one year).² In the efficacy cohort of women aged 17 to 35 years from the Phase 3 study (n=1397), the first-year Pearl Index was 0.94 (95% CI, 0.43-1.78) and the cumulative 3-year Pearl Index was 1.05 (95% CI, 0.66-1.60)² – in other words, 99% effective, with an overall placement success rate of ~99%.³ The most common adverse reactions (≥5%) observed in clinical trials were heavy menstrual bleeding, dysmenorrhea, intermenstrual bleeding, pelvic discomfort, procedural pain, pelvic pain, post-procedural hemorrhage, and dyspareunia.³ In the first year, 8.5% of participants across all three studies discontinued treatment due to bleeding or pain adverse reactions, which decreased to 3.2% by year 3.³ Expulsion rates related to discontinuation ranged from 1.9% in year 1 to 0.9% in year 3.³

Indication

• MIUDELLA^® is a copper-containing intrauterine system (IUS) indicated for prevention of pregnancy in females of reproductive potential for up to 3 years.

Selected Safety Information

WARNING: RISK OF COMPLICATIONS DUE TO IMPROPER INSERTION

• Improper insertion of intrauterine systems, including MIUDELLA, increases the risk of complications.
• Proper training prior to first use of MIUDELLA can minimize the risk of improper insertion.
• MIUDELLA is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the MIUDELLA REMS program to ensure all healthcare providers are trained on the proper insertion of MIUDELLA prior to first use. Further information is available at miudellarems.com and 1-855-337-0772.

CONTRAINDICATIONS

• Use of MIUDELLA is contraindicated when 1 or more of the following conditions exist:
  • Pregnancy or suspicion of pregnancy; congenital or acquired abnormalities of the uterus, including leiomyomas, resulting in distortion of the uterine cavity; acute pelvic inflammatory disease (PID); postpartum endometritis or postabortal endometritis in the past 3 months; known or suspected uterine or cervical malignancy; for use as postcoital contraception (emergency contraception); uterine bleeding of unknown etiology; untreated acute cervicitis or vaginitis or other lower genital tract infection; conditions associated with increased susceptibility to pelvic infections; Wilson’s disease; a previously placed IUS that has not been removed; hypersensitivity to any component of MIUDELLA including to polypropylene, copper, nitinol, an alloy of nickel and titanium, or any of the trace elements present in the copper component of MIUDELLA. Persons with allergic reactions to these components may suffer an allergic reaction to this intrauterine system. Prior to placement, patients should be counseled on the materials contained in the IUS, as well as potential for allergy/hypersensitivity to these materials.

WARNINGS AND PRECAUTIONS

• Risk of Complications Due to Improper Insertion: Improper insertion of IUSs, including MIUDELLA, increases the risk of perforation, infection, undiagnosed abnormal bleeding, pregnancy loss (if pregnancy occurs with IUS in situ), and expulsion. Proper training prior to first use of MIUDELLA can minimize the risk of improper insertion. MIUDELLA is available only through a restricted program under a REMS.
  
  
• MIUDELLA REMS: MIUDELLA is only available through a restricted program under a REMS called MIUDELLA REMS Program to ensure healthcare providers are trained prior to first use. Notable requirements include the following:
  • Healthcare providers must be certified with the program by enrolling and completing training on the proper insertion of MIUDELLA prior to first use.
  • Pharmacies and healthcare settings that dispense MIUDELLA must be certified by enrolling in the REMS and must only dispense MIUDELLA to certified healthcare providers.
    

• Further information is available at www.miudellarems.com and 1-855-337-0772.
  

• Ectopic Pregnancy: Promptly evaluate females who become pregnant for ectopic pregnancy while using MIUDELLA. Ectopic pregnancy may require surgery and may result in loss of fertility.
  
  
• Intrauterine Pregnancy: Increased risk of spontaneous abortion, septic abortion, premature delivery, sepsis, septic shock, and death if pregnancy occurs. Remove MIUDELLA if pregnancy occurs with MIUDELLA in place and the thread ends are visible or can be retrieved from the cervical canal.
  
  
• Sepsis: Severe infection or sepsis, including Group A streptococcal sepsis (GAS), have been reported following insertion of IUSs; strict aseptic technique is essential during insertion.
  
  
• Pelvic Infection: Promptly examine users with complaints of lower abdominal or pelvic pain, odorous discharge, unexplained bleeding, fever, genital lesions or sores after insertion of MIUDELLA. IUSs have been associated with an increased risk of PID, most likely due to organisms being introduced into the uterus during insertion. Remove MIUDELLA in cases of recurrent PID or endometritis, or if an acute pelvic infection is severe or does not respond to treatment.
  
  Subclinical PID: PID may be asymptomatic but still result in tubal damage and its sequelae.
  
  
• Perforation: Partial or total perforation of the uterine wall or cervix may occur during insertions, although the perforation may not be detected until sometime later. Perforation may also occur at any time during IUS use. Perforation that results in embedment or translocation may reduce contraceptive efficacy and result in pregnancy. Risk is increased if inserted in postpartum and lactating females and may be increased if inserted in females with fixed, retroverted uteri or noninvoluted uteri. If perforation is suspected or if known perforation occurs during placement, the IUS should be removed as soon as possible. Surgery may be required. Delayed detection or removal of MIUDELLA in cases of perforation may result in migration outside the uterine cavity, adhesions, peritonitis, intestinal penetration, intestinal obstruction, abscesses and/or damage to adjacent organs.
  
  
• Expulsion: Partial or complete expulsion of MIUDELLA has been reported, resulting in the loss of contraceptive protection. MIUDELLA should be placed no earlier than 4 weeks post-pregnancy to mitigate the risk of expulsion that may be increased when the uterus is not completely involuted at the time of insertion. Remove a partially expelled MIUDELLA and do not attempt to push a partially expelled MIUDELLA into the uterus.
  
  
• Wilson’s Disease: MIUDELLA may exacerbate Wilson’s disease, a rare genetic disease affecting copper excretion; therefore, the use of MIUDELLA is contraindicated in females with Wilson’s disease.
  
  
• Bleeding Pattern Alterations: Menstrual bleeding may be altered and result in heavier and longer bleeding with spotting. Females complaining of heavy vaginal bleeding should be evaluated and treated, and may need to discontinue MIUDELLA.
  
  
• Magnetic Resonance Imaging (MRI) Safety Information: Patients using MIUDELLA can be safely scanned with MRI only under certain conditions.
  
  
• Medical Diathermy: Medical equipment that contains high levels of Radiofrequency (RF) energy such as diathermy may cause health effects (by heating tissue) in females with a metal-containing IUS including MIUDELLA. Avoid using high medical RF transmitter devices in females with MIUDELLA.

ADVERSE REACTIONS

• Most common adverse reactions (≥5%) observed in clinical trials were heavy menstrual bleeding, dysmenorrhea, intermenstrual bleeding, pelvic discomfort, procedural pain, pelvic pain, post-procedural hemorrhage, and dyspareunia.

Before prescribing MIUDELLA, please read the full Prescribing Information, including Boxed Warning.

About Organon

Organon (NYSE: OGN) is a global healthcare company with a mission to deliver impactful medicines and solutions for a healthier every day. With a portfolio of over 70 products across Women’s Health and General Medicines, which includes biosimilars, Organon focuses on addressing health needs that uniquely, disproportionately, or differently affect women, while expanding access to essential treatments in over 140 markets.

Headquartered in Jersey City, New Jersey, Organon is committed to advancing access, affordability, and innovation in healthcare. Learn more at http://www.organon.com and follow us on LinkedIn, Instagram, X, YouTube, TikTok and Facebook.

About Sebela Pharmaceuticals

At Sebela Pharmaceuticals, we are building a leading gastroenterology company in the United States and developing innovative products in women’s health. Braintree Laboratories, Inc., a part of Sebela Pharmaceuticals, has been innovating, developing, manufacturing, and commercializing gastroenterology products for over 40 years. Braintree has filed an NDA with FDA for tegoprazan, its lead program in GERD. In 2025 Sebela Women’s Health obtained FDA approval for Miudella (copper-containing intrauterine system), the first non-hormonal intrauterine device (IUD) for contraception approved in over 40 years. Sebela Pharmaceuticals has operations in Braintree, MA; and Dublin, Ireland.

For more information, visit www.sebelapharma.com.

Cautionary Note Regarding Organon’s Forward-Looking Statements

Except for historical information, this press release includes “forward-looking statements” within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, including, but not limited to, statements about the potential benefits of Organon’s exclusive license of global rights to MIUDELLA^® and expectations regarding the timing of commercialization thereof. Forward-looking statements may be identified by words such as “anticipated,” “may,” “will,” and “expected,” among others. These statements are based upon the current beliefs and expectations of the company’s management and are subject to significant risks and uncertainties. If underlying assumptions prove inaccurate, or risks or uncertainties materialize, actual results may differ materially from those set forth in the forward-looking statements. Risks and uncertainties include, but are not limited to, weakening of economic conditions that could adversely affect the level of demand for MIUDELLA^®; pricing pressures globally, including rules and practices of managed care groups, judicial decisions and governmental laws and regulations related to or affecting Medicare, Medicaid and healthcare reform, pharmaceutical pricing and reimbursement, access to the company’s products, international reference pricing, including most-favored-nation drug pricing, and other pricing related initiatives and policy efforts; the impact of tariffs and other trade restrictions or domestic sourcing requirements; expanded brand and class competition in the markets in which the company operates; the failure of any supplier to provide substances, materials, or services as agreed, or otherwise meet their obligations to the company; the increased cost of supply, manufacturing, packaging, and operations; difficulties developing and sustaining relationships with commercial counterparties, including Sebela Pharmaceuticals; the impact of higher selling and promotional costs; efficacy, safety or other quality concerns with respect to the company’s marketed products, whether or not scientifically justified, leading to product recalls, withdrawals, labeling changes or declining sales; future actions of third parties, including significant changes in customer relationships or changes in the behavior and spending patterns of purchasers of healthcare products and services, including delaying medical procedures, rationing prescription medications, reducing the frequency of physician visits and forgoing healthcare insurance coverage; the failure by the company or its third party collaborators and/or their suppliers to fulfill their or their regulatory or quality obligations; and volatility of commodity prices, fuel, and shipping rates that impact the costs and/or ability to supply the company’s products. The company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. Additional factors that could cause results to differ materially from those described in the forward-looking statements can be found in the company’s filings with the SEC, including the company’s most recent Annual Report on Form 10-K and subsequent SEC filings, available at the SEC’s Internet site (www.sec.gov). References and links to websites have been provided for convenience, and the information contained on any such website is not a part of, or incorporated by reference into, this press release. Organon is not responsible for the contents of third-party websites.

Sebela Forward-Looking Statement

This press release and any statements made for and during any presentation or meeting contain forward-looking statements related to Sebela Pharmaceuticals, Sebela Women’s Health and Braintree Laboratories under the safe harbor provisions of Section 21E of the Private Securities Litigation Reform Act of 1995 and are subject to risks and uncertainties that could cause actual results to differ materially from those projected. These statements may be identified by the use of forward-looking words such as “anticipate,” “planned,” “believe,” “may,” “will,” “forecast,” “estimated,” “expected,” and “intend,” among others. There are several factors that could cause actual events to differ materially from those indicated by such forward-looking statements. These factors include, but are not limited to, risks related to the development, launch, introduction and commercial potential of Miudella; growth and opportunity, including peak sales and the potential demand for Miudella, as well as its potential impact on applicable markets; market size; substantial competition; our ability to continue as a going concern; our need for additional financing; uncertainties of patent protection and litigation; uncertainties of government or third-party payer reimbursement; dependence upon third parties; our financial performance and results, including the risk that we are unable to manage our operating expenses or cash use for operations, or are unable to commercialize our products, within the guided ranges or otherwise as expected; and risks related to noncompliance with FDA regulations. As with any pharmaceutical under development, there are significant risks in the development and commercialization of new products. There are no guarantees that Miudella will prove to be commercially successful. While the list of factors presented here is considered representative, no such list should be considered a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward-looking statements. Forward-looking statements included herein are made as of the date hereof, and neither Sebela Pharmaceuticals, Sebela Women’s Health, nor Braintree Laboratories agree to undertake any obligation to update publicly such statements to reflect subsequent events or circumstances, except as required by law.

^{1 Data on file. Organon group of companies.}

^{2 Creinin MD, Gawron LM, Roe AH, et al. Three-year efficacy, safety, and tolerability outcomes from a phase 3 study of a low-dose copper intrauterine device. Contraception. 2025;143:110771. doi:10.1016/j.contraception.2024.110771}

^{3 MIUDELLA. Package insert. Organon; 2026.}

US-MIU-110110 10/26

Media Contacts:

Janine Colavita
(732) 861-3806

Karissa Peer
(614) 314-8094

Investor Contacts:

Jennifer Halchak
(201) 275-2711

Renee McKnight
(551) 204-6129