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Could a thyroid hormone boost fertility in PCOS? new trial tests combination therapy

NCT ID NCT06041204

Disease control Sponsor: Muhamed Ahmed Abdelmoaty Muhamed Alhagrasy Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This study tests whether adding levothyroxine (a thyroid hormone) to the standard fertility drug letrozole helps women with PCOS and mild underactive thyroid ovulate and get pregnant. Two hundred women will be randomly assigned to receive either letrozole alone or letrozole plus levothyroxine for up to six months. The goal is to see if the combination leads to higher pregnancy and live birth rates.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
letrozole and levothyroxine
What this could lead to
If successful, this could show that adding levothyroxine to letrozole improves ovulation and pregnancy rates in women with both PCOS and subclinical hypothyroidism.
What could go wrong
This is a relatively small, early-stage trial with 200 participants. The results may not apply to all women, and the benefit of adding levothyroxine might be small or absent.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 200 people

The number the study aims to enrol. It can still change while the study runs.

Started

May 2021

Expected to finish

Jun 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

20 to 40 years

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: Age between 20-40 years BMI between 18-35 kg/m2 Meet diagnostic criteria for PCOS based on the Rotterdam consensus criteria and ESHRE/ASRM modifications (2018): Oligo- and/or anovulation Clinical and/or biochemical signs of hyperandrogenism Polycystic ovaries on ultrasound Subclinical hypothyroidism defined as TSH level between 5-10 mIU/L with normal free T4 Infertility duration ≥ 1 year Intact ovaries and uterus, confirmed by physical exam and imaging Normal semen analysis in male partner No tubal or peritoneal factor contributing to infertility Effective contraception if not attempting conception Willing and able to provide informed consent Exclusion Criteria: Known thyroid disease or on thyroid medications Abnormal thyroid function tests other than subclinical hypothyroidism Hyperprolactinemia Presence of other causes of infertility such as: Moderate to severe male factor infertility Bilateral tubal occlusion or peritoneal factors Stage III-IV endometriosis Ovarian failure or insufficiency (high FSH or low AMH) Previous diagnosis of any type of congenital adrenal hyperplasia Uncontrolled diabetes (HbA1C \>8%) History of deep vein thrombosis or thromboembolic events Any contraindication to letrozole or levothyroxine Previous use of letrozole or levothyroxine in past 6 months Current or suspected pregnancy Breastfeeding Inability to comply with treatment and follow-up procedures

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Conditions

The condition(s) this trial relates to.

female infertility hypothyroidism polycystic ovary syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Female infertility PCOS (polycystic ovary syndrome) of bilateral ovaries Subclinical hypothyroidism

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Al-Hussein University Hospital

    RECRUITING

    Cairo, 11633, Egypt

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