Gestanin tablets is a hormone applied to prevent habitual spontaneous abortion and to prevent premature labour. Gestanin pills is a hormone progestogen similar to progesterone. The medication stimulates a secretory phase of the cyclic changes in endometrium and creates conditions for development of the fertilized egg, reduces contractile activity and sensitivity to oxytocin of the muscular outer layer of the uterus. Gestanin also activates growth of acini of the mammary glands, increases deposits of fat, promotes accumulation of liver glycogen and increases metabolism of glucose, increases production of aldosterone by the adrenal glands. Gestanin is used to prevent a miscarriage, a preterm birth.