Inositol in Letrozol Resistant PCOS Women

May 14, 2026 updated by: Aya Mohsen Mahnoud Aboelkhier, Kafrelsheikh University

Efficacy of Inositol in Managing Subfertility in Letrozole-resistant Polycystic Ovary Syndrome Women

Polycystic ovary syndrome (PCOS),is a complex neuro-endocrine disorder affecting approximately 5% to 10% of women in reproductive age.Inositols are considered insulin sensitizers, as they modulate the members of insulin signaling pathways.Thiss study compares between the effect of inositol and metformin in letrozol resistant PCOS women.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Polycystic ovary syndrome (PCOS),is a complex neuro-endocrine disorder affecting approximately 5% to 10% of women in reproductive age .Furthermore, impaired glucose tolerance affects 30 - 40 % of women with PCOS and the pathophysiology of insulin resistance appears to be linked to a malfunction in the insulin signalling system. Insulin-sensitizing substances, including the B-complex vitamin inositol and its stereoisomers (myo-inositol and D-chiro-inositol )have therefore been investigated as a potential treatment for PCOS.

Letrozole is the recommended medication for ovulation induction in PCOS-related infertility since it produces higher pregnancy and live birth rates than Clomphine Citrate. Alternative regimens, such as two-step, higher, and prolonged doses, may be necessary for women who are not responding to the standard letrozole dosage. However, some women might not respond to letrozole even at the highest dosage.

Inositols are produced by the human body and are a member of the vitamin B complex group.Inositols are considered insulin sensitizers, as they modulate the members of insulin signaling pathways. They positively influence menstrual cycle regularity, carbohydrate metabolism, and the clinical and laboratory symptoms of hyperandrogenism (e.g., free testosterone, total testosterone, SHBG).

Study Type

Interventional

Enrollment (Actual)

36

Phase

  • Phase 2
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Egypt
      • Cairo, Egypt
        • Kafrelshiekh university hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • • Age between 18- 35 years old.

    • Diagnosis of PCOS according to Rotterdam criteria
    • Letrozole resistant cases.
    • Normal thyroid hormone level.
    • Normal prolactin hormone level.

Exclusion Criteria:

  • • History of ovarian surgery.

    • cases associated with endometriosis.
    • History of diabetes mellitus.
    • Allergy to myo-Inositol .

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Myoinositol group
Combined myoinositol twice daily for 3 months plus letrozole
Drug: Myoinositol
Combined myoinositol & Dchiroinositol twice daily plus letrozole for 3 months
Active Comparator: Metformin group
Metformin 500mg oral twice daily plus letrozole for 3 months
Drug: Metformin
Metformin 500mg twice daily plus letrozole for 3 months

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Ovulation rate confirmed by folliculometry measured by transvaginal ultrasound
Time Frame: 3 months after taaking letrozole only for 3 months
3 months after taaking letrozole only for 3 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Kafrelsheikh University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 10, 2025

Primary Completion (Actual)

May 10, 2026

Study Completion (Actual)

May 11, 2026

Study Registration Dates

First Submitted

May 7, 2026

First Submitted That Met QC Criteria

May 7, 2026

First Posted (Actual)

May 13, 2026

Study Record Updates

Last Update Posted (Actual)

May 18, 2026

Last Update Submitted That Met QC Criteria

May 14, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • KFSIRB200-600

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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