Vaginal tablets of 100 mg. Reduced ability to fertilize in primary or secondary infertility with partial or complete luteal insufficiency (disovulation, support of the luteal phase during preparation for in vitro fertilization, egg donation program). Prevention of habitual miscarriage or the threat of spontaneous miscarriage in luteal insufficiency. Prevention of premature birth in women with a short cervix or in women with a history of spontaneous premature birth. Impossibility or restriction of oral administration of the drug. Vaginal tablets of 200 mg are Recommended in IVF programs.