Ovulation Incidence in Oral Contraceptive Users

Completed · Phase 3

Conditions studied: Contraception, Ovulation

In brief

Since the introduction of the combined hormonal contraceptive pill, dosages of ethinyl estradiol (EE) have steadily decreased from more than 150mcg to 20mcg in an attempt to improve the risk profile associated with the COC. In 2010, the Food and Drug Administration approved a oral contraceptive pill containing EE 10mcg/NET acetate 1mg (Tradename Lo loestrin). However, no studies have compared this formulation to pills containing either higher doses of estrogen or progestin alone. It is not known whether EE 10mcg is sufficient to prevent follicular development or to support the endometrium as well as higher doses of EE. This trial addresses the question of whether an oral contraceptive pill with EE 10mcg/Norethindrone acetate 1mg will better suppress ovulation or have a better side effect profile than a progestin only pill with a nearly equal dose of norethindrone.

Key facts

Study ID

NCT03106454

Run by

University of Southern California

People needed

58

Starts

2014-08-01

Expected to finish

2024-01-01

Last updated by the study team

2025-12-26

Who can join

Age: 18 and older, up to 45. Sex: female. Healthy volunteers: accepted.

You may qualify if…

• Reproductive aged women 18-45 years old.
• Menstrual cycle length 25-35days
• BMI less than or equal to 40
• English or Spanish speaking

You may not qualify if…

• Pregnant or breastfeeding in the previous 3 months.
• Use of OC, hormonal vaginal rings or patches, levonorgestrel containing intrauterine device, or etonogestrel implant in the previous 1 month. No use of depot medroxyprogesterone acetate (DMPA) injection in the previous 6 months and at least one menses since discontinuation.
• Medical contraindications to estrogen or progestin use. Specifically: smoking among participants over 35 years old, migraines with aura, history of blood clots, ischemic heart disease, stroke, breast cancer, cervical cancer, liver disease, symptomatic gallbladder disease, uncontrolled hypertension, antiphospholipid antibody syndrome, hyperlipidemia, diabetes with end organ damage (retinopathy, nephropathy, neuropathy) or diagnosis >20 years ago, organ transplant
• Desire to become pregnant in the next 4 months

Where it is running

• Brian T. Nguyen — Los Angeles, California, United States

Full record on ClinicalTrials.gov

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