A Phase 3 interventional study of NOMAC-E2 COC in Contraception, sponsored by Organon and Co. Terminated at 103 sites in United States. Open to female participants aged 14 Years to 35 Years. Per ClinicalTrials.gov, last updated 2025-11-21.
Sponsored by Organon and Co · Phase 3, Interventional, and Prevention
The purpose of this study is evaluating Contraceptive Efficacy and Safety of NOMAC-E2 Combined Oral Contraceptive in Premenopausal Females Aged 14 to 35 Years (Inclusive).
This is a Phase 3, Open-label, Multi-center, Single-arm Study to Assess Contraceptive Efficacy and Safety of the Nomegestrol Acetate + 17β-estradiol Combined Oral Contraceptive (OG-8175A) in Premenopausal Females Aged 14 to 35 Years (Inclusive). Potential participants must be sexually active and engage in heterosexual vaginal intercourse at least once per month with a partner who is not known to be subfertile, sterilized, or infertile, and should not routinely use any other form of contraception.
A total of 2,680 fertile premenopausal women aged 14 to 35 years (inclusive) will be screened to achieve about 1,878 (with at least 657 participants with BMI ≥30 kg/m2) being allocated to study treatment. Over 1,000 total participants are expected to complete 1 year of treatment (13 cycles).
The total duration of study participation will be up to 60 weeks, which includes a Pre-treatment Period of approximately 6 weeks, a Treatment Period of 52 weeks, and a Follow-up Period of 2 weeks after the last intake of study drug.
Organon and Co is the lead sponsor of 478 studies on the registry; none are open to participants now.
Of its 21 completed or terminated interventional studies of FDA-regulated products, 17 (81%) have results posted.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
The NOMAC-E2 COC active tablets contain 2.5 mg NOMAC and 1.5 mg E2 and will be used in a 24/4 regimen, i.e., 28-day cycles with 24 days of active tablet intake followed by 4 days of placebo tablet intake.
Drug: NOMAC-E2 COC
Dosage Formulation: Film-coated Tablet Unit Dose Strength: Nomegestrol acetate (NOMAC) 2.5 mg and estradiol (E2) 1.5 mg; Each blister strip contains 28 tablets: 24 tablets with the active drug (number 1 to 24) and 4 tablets with placebo (number 25 to 28). Dosing Instructions: oral. Take 1 tablet daily at about the same time as directed.
Also known as: Nomegestrol acetate / estradiol
Number of Participants With On-treatment Pregnancies
Raw count of the number of pregnancies that occurred while participants were taking study drug
Time frame: 1 year
Proportion of Participants With an Adverse Event (Regardless on Potential Relationship to Study Drug)
Time frame: 1 year
Proportion of Participants Who Prematurely Discontinue Study Drug Treatment
Time frame: 1 year
Percentage of Participants With On-treatment Pregnancies With at Least One Completed Cycle
Number of participants with on-treatment pregnancies as a percentage of the number of participants with at least one completed cycle
Time frame: 1 year
Number of Cycles of Exposure Prior to Pregnancy
In participants who experienced on-treatment pregnancy, the mean number of completed treatment cycles prior to occurrence of the pregnancy (for participants with known date of conception)
Time frame: 1 year
Number of Participants With a Pregnancy, Based on Baseline BMI Categories (<30 kg/m2, ≥30 kg/m2)
Raw count of the number of pregnancies that occurred while participants were taking study drug in each BMI category
Time frame: 1 year
Proportion of Participants With Bleeding-spotting Days
Number of participants with bleeding-spotting days as a proportion of the number of participants who had at least one completed cycle
Time frame: 28-day cycles across one year
Mean Number of Bleeding and/or Spotting Days Per Cycle
For participants who had at least one completed cycle, the mean number of bleeding-spotting days per cycle
Time frame: 28-day cycles across one year
Average Number of Bleeding-spotting Days Per Reference Period
For participants with at least one completed reference period, the average number of bleeding-spotting days per reference period
Time frame: 91-day reference periods across one year
Proportion of Participants With 8 or More Bleeding-spotting Days
Proportion of participants who had at least one completed cycle with 8 or more bleeding-spotting days in a cycle
Time frame: 28-day cycles across one year
Mean NOMAC Concentration, Visit 3 Pre-Dose
NOMAC concentrations assessed through use of sparse sampling
Time frame: Treatment Week 5
Mean NOMAC Concentration, Visit 3 Post-Dose
NOMAC concentrations assessed through use of sparse sampling
Time frame: Treatment Week 5
Mean NOMAC Concentration, Visit 4 Pre-Dose
NOMAC concentrations assessed through use of sparse sampling
Time frame: Treatment Week 17
Mean NOMAC Concentration, Visit 4 Post-Dose
NOMAC concentrations assessed through use of sparse sampling
Time frame: Treatment Week 17
| Milestone | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Started | 1919 |
| Completed | 402 |
| Not completed | 1517 |
| Withdrew: Adverse event | 59 |
| Withdrew: Lost to follow-up | 204 |
| Withdrew: Protocol violation | 185 |
| Withdrew: Pregnancy | 60 |
| Withdrew: Physician decision | 6 |
| Withdrew: Non-compliance with study drug | 29 |
| Withdrew: Study termination | 677 |
| Withdrew: Withdrawal by subject | 208 |
| Withdrew: Discontinued prior treatment | 89 |
Raw count of the number of pregnancies that occurred while participants were taking study drug
| Participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Number of Participants With On-treatment Pregnancies | 57 |
| participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Proportion of Participants With an Adverse Event (Regardless on Potential Relationship to Study Drug) | 485 |
| participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Proportion of Participants Who Prematurely Discontinue Study Drug Treatment | 62 |
Number of participants with on-treatment pregnancies as a percentage of the number of participants with at least one completed cycle
| percentage of participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Percentage of Participants With On-treatment Pregnancies With at Least One Completed Cycle | 3.1 |
In participants who experienced on-treatment pregnancy, the mean number of completed treatment cycles prior to occurrence of the pregnancy (for participants with known date of conception)
| completed cycles | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Number of Cycles of Exposure Prior to Pregnancy | 4.2 ± 3.47 |
Raw count of the number of pregnancies that occurred while participants were taking study drug in each BMI category
| Participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| BMI <30 kg/m2 | 39 |
| BMI >=30 kg/m2 | 18 |
Number of participants with bleeding-spotting days as a proportion of the number of participants who had at least one completed cycle
| participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Proportion of Participants With Bleeding-spotting Days | 1721 |
For participants who had at least one completed cycle, the mean number of bleeding-spotting days per cycle
| bleeding-spotting days | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Mean Number of Bleeding and/or Spotting Days Per Cycle | 4.0 ± 3.44 |
For participants with at least one completed reference period, the average number of bleeding-spotting days per reference period
| bleeding-spotting days | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Average Number of Bleeding-spotting Days Per Reference Period | 13.1 ± 8.54 |
Proportion of participants who had at least one completed cycle with 8 or more bleeding-spotting days in a cycle
| participants | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Proportion of Participants With 8 or More Bleeding-spotting Days | 709 |
NOMAC concentrations assessed through use of sparse sampling
| ng/mL | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Mean NOMAC Concentration, Visit 3 Pre-Dose | 32.26 ± 310.457 |
NOMAC concentrations assessed through use of sparse sampling
| ng/mL | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Mean NOMAC Concentration, Visit 3 Post-Dose | 73.61 ± 742.410 |
NOMAC concentrations assessed through use of sparse sampling
| ng/mL | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Mean NOMAC Concentration, Visit 4 Pre-Dose | 36.01 ± 229.607 |
NOMAC concentrations assessed through use of sparse sampling
| ng/mL | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Mean NOMAC Concentration, Visit 4 Post-Dose | 58.01 ± 363.400 |
Collected over All AEs and SAEs were collected from the time of screening through the end of study/end of treatment visit, which was 14 to 19 days after the last intake of study drug, up to approximately 1 year, 1 month.. Non-serious events are listed at a 5% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) | 0/1,830 (0%) | 10/1,830 (0.5%) | 0/1,830 (0%) |
| Event | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Abortion spontaneousPregnancy, puerperium and perinatal conditions | 3/1830 |
| Suicidal ideationPsychiatric disorders | 2/1830 |
| Burns third degreeInjury, poisoning and procedural complications | 1/1830 |
| Ligament ruptureInjury, poisoning and procedural complications | 1/1830 |
| HeadacheNervous system disorders | 1/1830 |
| ParaesthesiaNervous system disorders | 1/1830 |
| Bipolar disorderPsychiatric disorders | 1/1830 |
| Ovarian cyst rupturedReproductive system and breast disorders | 1/1830 |
| Deep Vein ThrombosisVascular disorders | 1/1830 |
| HypertensionVascular disorders | 1/1830 |
The Safety Analysis Set consists of all participants who took at least one dose of the study treatment.
| Age, Continuous(years) | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Mean | 27.2 ± 4.99 |
| Sex: Female, Male(Participants) | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Female | 1830 |
| Male | 0 |
| Ethnicity (NIH/OMB)(Participants) | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| Hispanic or Latino | 1004 |
| Not Hispanic or Latino | 817 |
| Unknown or Not Reported | 9 |
| Race (NIH/OMB)(Participants) | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| American Indian or Alaska Native | 15 |
| Asian | 29 |
| Native Hawaiian or Other Pacific Islander | 6 |
| Black or African American | 356 |
| White | 1358 |
| More than one race | 34 |
| Unknown or Not Reported | 32 |
| Region of Enrollment(Participants) | Nomegestrol Acetate + 17β-estradiol (NOMAC-E2; OG-8175A) |
|---|---|
| United States | 1830 |
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