About the Study
The E4Comfort Study is evaluating an oral study medication to see if it may reduce hot flashes and night sweats in post-menopausal women. Estetrol, the study medication, is a synthetic form of the naturally occurring estrogen. It has shown in early testing to have minimal side effects.
How Can I Qualify?
You may be able to participate if you:
- Are a post-menopausal woman aged 40-65 years
- Experience moderate-to-severe hot flushes
- Started menopause within the last 10 years
- Do not have a history of cancer, diabetes, or heart disease
Additional requirements will apply. The study staff can provide more details.
Participation in this study is completely voluntary, and you may withdraw from the study at any time.
Why Participate?
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All study-related care will be provided at no cost
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The study staff will closely monitor you, your symptoms and your overall health
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You will be helping to advance knowledge of women’s health
About Hot Flushes and Night Sweats
Hot flushes and night sweats can be uncomfortable and disruptive. They are, however, a real medical condition that can be treated. If you have moderate-to-severe hot flushes, consider participating in a research study.
A hot flush is a sudden sensation of heat in the face, neck, chest, or all over that may cause you to become flushed and sweat heavily. Hot flushes that happen at night are called night sweats. Up to 80% of women experience hot flushes during menopause.
Hot flushes may be caused by fewer hormones, such as oestrogen and progesterone, being produced during menopause. These changes in hormone levels can affect your body’s temperature control system.

Frequently Asked Questions
About Clinical Research Studies
A clinical research study, also known as a clinical trial, is a scientific study that evaluates the safety and effectiveness of a study medication. Qualified doctors, nurses and other medical professionals are responsible for conducting the study.
It is only through the completion of clinical research studies that study medications can be evaluated and, if proven safe and effective, approved for a particular use. Different regulatory bodies in different countries will provide this approval after a thorough review. Prescription medications in use today were first proven to be safe and effective during clinical research studies.
To help ensure that a clinical research study is ethical and that patients’ rights are protected, Institutional Review Boards (IRB) or Ethics Committees (EC) review and approve study protocols that detail all aspects of how the study is conducted. In addition, study monitors, also known as clinical research associates, visit the study sites to confirm the study protocol procedures and research study requirements and regulations are being followed throughout the study. Health authorities may also inspect the study sites to ensure the safety and rights of the subjects participating in a trial and the integrity of the research study objectives.
Only participants who meet all required eligibility criteria for a research study may take part. The study staff at the clinic you select will review your medical history and current medical status against the eligibility criteria. They will determine if you are eligible to participate in the study. You may also be asked to provide information from your medical records to help the study staff determine if you could be eligible.
A study medication, sometimes called an investigational medication or investigational drug, is a product that has not been approved by appropriate regulatory or health authorities (e.g. a country’s ethics committee) for medical use.
About the E4Comfort Study
Estetra SPRL of Mithra Pharmaceuticals is the study sponsor.
The purpose of the E4Comfort Study is to evaluate the safety and effectiveness of estetrol in women who experience hot flushes and night sweats.
The E4Comfort Study lasts about 7 to 16 months. The study staff can provide you with more information about the study visits.
Before you agree to participate, the study staff will review all aspects of the study with you, including required study assessments. You will be given a document called an “Informed Consent Form” that provides, in writing, the study’s purpose, assessments, procedures, benefits, risks and precautions. You will have the opportunity to ask questions and are encouraged to speak with your own doctor to decide if taking part is right for you.
Study Medication
The name of the study medication is estetrol. Estetrol is a synthetic form of the naturally occurring oestrogen.
A placebo looks like the study medication but is an inactive substance. It is used in clinical research studies to determine if the study medication is more effective than no treatment at all. The study staff can give you more information about whether or not you may receive placebo during the study.
Privacy, Stopping Participation, Costs and Permission
The study staff respects and protects your privacy and will not share your personal information, except as required by law. Your personal information will be stored with codes that do not identify you. The Informed Consent Form will provide more information about how your privacy will be maintained.
Yes. Your participation in the research study is entirely voluntary, and you may withdraw at any time. If you decide to withdraw early from the study, you will be asked to notify the study staff so you can complete a final visit and return any unused study medication.
No. There is no charge for taking part in the study. All study-related assessments and study medication are provided at no charge.
No. You will not be paid for taking part in the study. The study staff can inform you about reimbursement for expenses incurred to attend study visits if you are eligible and are referred to a clinic.
No. Your doctor does not have to give his/her permission for you to take part in the study. However, either you or the study doctor, with your permission, may contact your personal doctor to discuss your participation before you begin and keep him/her up-to-date about your progress.