A Phase 4 interventional study of Progesterone 200 MG Oral Capsule in Smoking, Smoking Cessation and Smoking Reduction, sponsored by University of Minnesota. Recruiting at 1 site in United States. Open to female participants aged 18 Years to 45 Years. Per ClinicalTrials.gov, last updated 2026-07-13.
Sponsored by University of Minnesota · Phase 4, Interventional, and Prevention
The investigators aim to address the following specific aims:
This Good Clinical Practice clinical trial will be implemented by an experienced, transdisciplinary, and productive team of investigators to enhance the diversity of the study sample and generalizability of results. We will enroll healthy pregnant women (following enrollment, all subsequent study procedures will be completed postpartum) or postpartum women on hormonal birth control or no hormonal birth control with either a recent history of smoking and a desire to remain abstinent after childbirth, or who are currently smoking and motivated to quit smoking. Participants will be recruited throughout the continental United States (US) and will participant in an observational arm of the study. Participants living in Minnesota (our clinical site) will receive a 12-week course of exogenous progesterone. All participants will be followed for six months with remote visits, self-administered surveys, and self-collection of dried blood spots to measure hormones and smoking-related biomarkers.
56 studies on the registry are indexed under Smoking Reduction; 13 are open to participants now.
This study's planned enrollment of 171 is below the median of 222 across 48 interventional studies indexed under Smoking Reduction.
Browse Smoking Reduction studies →University of Minnesota is the lead sponsor of 1,216 studies on the registry; 197 are open to participants now.
Of its 136 completed or terminated interventional studies of FDA-regulated products, 95 (70%) have results posted.
Compared within Smoking Reduction, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Smoking. The counts are of registry records indexed under each term, refreshed daily. How we classify →
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Self-reported stable physical and mental health
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.
Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CYP3A (CYP3A4) inhibitors and inducers
CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.
Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants in this group will receive progesterone
Drug: Progesterone 200 MG Oral Capsule
Participants in this group will not receive progesterone
Progesterone, 200mg, once daily, oral tablet/capsule
Smoking abstinence at Month 6
Time frame: 6 months
Child health assessed as smoke exposure and acute infant health.
Time frame: 6 months
Started Apr 2022 (actual). Primary completion is estimated for Jun 2027, 61 months after the start.
How these figures are worked out, and which studies are left out of them.
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Studies of the drug tested here: Progesterone