Clinical trial Recruiting at 12 sites Phase 3 Interventional Ages 18 and up Women only

Using melatonin to protect the brain in pregnancies with fetal growth restriction

Official title: A Triple-blinded, Randomized, Parallel-group Placebo-controlled Trial to Assess the Impact of Maternal Antenatal Melatonin Supplementation on Early Childhood Neurodevelopmental Outcomes in the Setting of Severe Preterm Fetal Growth Restriction

Run by Monash University · NCT05651347 · Data updated 2026-11-12

This study is testing if giving melatonin to pregnant women with severe fetal growth restriction can help improve their baby's health and protect against brain injury before birth.

Quick facts

PhasePhase 3
Study typeInterventional
Ages18 Years and up
SexWomen only
Enrollment336 (estimated)
SponsorMonash University
Academic / other
Locations12 sites (Camperdown, New South Wales and 11 other locations)
StatusRecruiting
StartedMay 29, 2019
Main results expectedApril 30, 2027
Study endsApril 30, 2027
Registry record updatedJune 6, 2025
Trial IDNCT05651347 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are pregnant women aged 18 and older, between 23 and 31 weeks of gestation, with singleton pregnancies diagnosed with severe fetal growth restriction.

Probably not a fit

Patients with known chromosomal or major structural anomalies in the fetus, or those requiring immediate delivery due to critical fetal conditions, may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial investigates the effects of antenatal melatonin supplementation in pregnant women experiencing severe fetal growth restriction (FGR). The study aims to determine whether melatonin can improve fetal wellbeing and reduce the risk of brain injury associated with in-utero hypoxia. Participants will receive either melatonin or a placebo during the critical weeks leading up to delivery, with assessments focused on fetal health and development. The trial is designed to provide insights into a potential new therapy that could enhance outcomes for infants born under these challenging conditions.

Why it matters

Potential benefit: If successful, this approach could significantly reduce the incidence of brain injury and improve long-term health outcomes for infants born with fetal growth restriction.

How similar studies have gone: While magnesium sulphate has shown some success in improving fetal brain development in similar contexts, the use of melatonin for this purpose is a novel approach that has not been extensively tested.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Singleton Pregnancy
2. Severe fetal growth restriction, defined as:

   * Abdominal circumference ≤3rd centile for gestational age according to charts supplied that have been adapted from Westerway et al; or
   * Abdominal circumference \<10th centile in combination with at least one abnormal fetoplacental Doppler study, being:

     * Uterine artery (raised pulsatility index ≥95th centile)
     * Umbilical artery (pulsatility index ≥95th centile or absent/reversed end-diastolic flow)
3. Confirmed 23+0 - 31+6 weeks' gestation
4. Age ≥18 years
5. Understand English

Exclusion Criteria:

1. A fetus with a known chromosomal, major structural anomaly or non-placental cause of fetal growth restriction
2. Pregnancies requiring immediate delivery (e.g. absent A wave in ductus venosus, preterminal CTG or biophysical profile)
3. Co-recruitment in another clinical trial where a pharmaceutical product or nutritional supplement impacting on oxidative stress is the trial intervention.
4. Currently prescribed Fluvoxamine

Where it's running

  • Royal Prince Alfred
    Camperdown, New South Wales, Australia
    Recruiting
  • John Hunter Hospital
    Newcastle, New South Wales, Australia
    Recruiting
  • Mater Misericordiae
    South Brisbane, Queensland, Australia
    Recruiting
  • Gold Coast University Hospital
    Southport, Queensland, Australia
    Recruiting
  • Women's and Children's Hospital
    North Adelaide, South Australia, Australia
    Recruiting
  • Monash Health
    Clayton, Victoria, Australia
    Recruiting
Show 6 more locations
  • Mercy Hospital
    Heidelberg, Victoria, Australia
    Recruiting
  • Royal Women's Hospital
    Parkville, Victoria, Australia
    Recruiting
  • Joan Kirner Hospital
    Saint Albans, Victoria, Australia
    Recruiting
  • Auckland Hospital
    Auckland, New Zealand
    Recruiting
  • Middlemore Hospital
    Auckland, New Zealand
    Recruiting
  • Wellington Regional Hospital
    Wellington, New Zealand
    Recruiting

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.