Dydron 10 mg contains the active ingredient Dydrogesterone, a synthetic hormone similar to the naturally occurring female hormone progesterone. It is commonly used in the treatment of menstrual disorders such as irregular periods, premenstrual syndrome (PMS), and painful menstruation (dysmenorrhea). It is also prescribed for conditions related to progesterone deficiency, such as infertility due to luteal insufficiency, threatened or habitual miscarriage, and as part of hormone replacement therapy (HRT). Dydrogesterone works by mimicking the action of natural progesterone to help regulate the menstrual cycle and support early pregnancy.