List of products in the National Drug Code with proprietary name . This medication is used to help prepare your cervix (the lower opening of the womb) for labor and delivery. It is used in women who are having a normal pregnancy and who are at or near their delivery due date. Dinoprostone is a natural substance that your body makes in preparation for labor. It relaxes and softens your cervix (cervical ripening) to allow the baby to pass through the birth canal during delivery.