 Dydrogesterone is marketed mainly under the brand names Duphaston (alone) and Femoston (in combination with estradiol).It also is or has been marketed alone under the brand names Dabroston, Dufaston, Duvaron, Gestatron, Gynorest, Prodel, Retrone, and Terolut and in combination with estradiol under the brand names Climaston, Femaston, and Femphascyl.Dydrogesterone is available widely throughout the world.