Hi, Tab Duphaston is a medication commonly prescribed during pregnancy. It contains the active ingredient dydrogesterone, a synthetic hormone similar to the natural hormone progesterone. Duphaston is primarily used to support and maintain the lining of the uterus, which is essential for a healthy pregnancy. Progesterone plays a crucial role in pregnancy by preparing the uterus for implantation and supporting the development of the fetus. Duphaston helps to supplement the body s progesterone levels, ensuring an adequate hormonal environment for the pregnancy to progress successfully. The medication is often prescribed in cases where there is a history of miscarriage or threatened miscarriage, as well as in cases of hormone deficiency or certain hormonal imbalances. By supporting progesterone levels, Duphaston can help prevent miscarriage and support a healthy pregnancy. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Diwashish Biswas, Internal Medicine Specialist