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What is the GUARD Trial?

In current clinical care, women with Gestational Diabetes Mellitus (GDM) are usually treated with a drug called metformin. The GUARD trial is looking at using another medicine called ursodeoxycholic acid (UDCA), a drug that is already used to treat pregnant women with another condition called intrahepatic cholestasis of pregnancy. There is evidence from other research studies to suggest that UCDA may be good at controlling glucose in both the mother and the baby. In turn this might improve pregnancy outcomes for the mother and the baby. The GUARD trial wants to explore the impact of UDCA compared to metformin in the treatment of GDM.

Who can take part in this trial?

Women who have been diagnosed with GDM and require to take medication to control their glucose levels. Research doctors will fully assess suitability against a list of criteria, to make sure that you are eligible.

What will happen to me if I take part?

Which NHS Trusts are taking part?

The following hospitals are currently open or planning to open to recruitment to this study:

  • Guy’s and St Thomas’ NHS Foundation Trust
  • Imperial College Healthcare NHS Trust
  • King’s College Hospital NHS Foundation Trust
  • Chelsea and Westminster Hospital NHS Foundation Trust
  • Mid and South Essex NHS Foundation Trust

If you would like more information about the GUARD Trial, please contact the research midwife at your local hospital, who can provide a detailed patient information leaflet.

Key dates

  • First participant enrolled: July 2021

Our Partners

Jon Moulton Charity

Guy's and St Thomas'  logo

Guy's and St Thomas' NHS Foundation Trust

Imperial College Healthcare NHS Trust logo

Imperial College Healthcare NHS Foundation Trust


National Institute for Health Research (NIHR)

GUARD logo V2

Contact us

Departments of Women and Children’s Health
10th Floor North Wing
St Thomas' Hospital
Westminster Bridge Road
London SE1 7EH