Dydronol 10mg Tablet is a hormone replacement therapy used to treat conditions caused by progesterone deficiencies, including female infertility, menstrual pain, PMS, endometriosis, abnormal uterine bleeding, and miscarriage. It is prescribed by a doctor and should be taken daily, preferably whole with water. Side effects include headache, nausea, vaginal bleeding, breast pain, and bleeding or spotting between menstrual periods. Patients should discuss any previous medical history, regular medications, and pregnancy or breastfeeding with their doctor before starting treatment.