Is Dienogest Safe in Breastfeeding

I am a breastfeeding mother and i want to know if it is safe to use Dienogest? Is Dienogest safe for nursing mother and child? Does Dienogest extracts into breast milk? Does Dienogest has any long term or short term side effects on infants? Can Dienogest influence milk supply or can Dienogest decrease milk supply in lactating mothers?

Synthetic progesterone. Used for the treatment of endometriosis.In association with estrogen it has been used as a birth-control medication (e.g. Estradiol + Dienogest) A latest update no published data on excretion into breast milk were found. Progesterone and other related progestin drugs are excreted into breast milk in clinically non-significant amount, and, no problems have been observed in infants whose mothers were treated with this medication. Plasma levels of these infants were usually very low. It has been occasionally observed an increase of prolactin with increased milk production, however, it would be advisable to start taking it until breastfeeding is well established (first 4 to 6 weeks postpartum).

Dienogest is only available in the United States in a combination oral contraceptive product that also contains estradiol valerate. Based on the available evidence, expert opinion holds that nonhormonal methods are preferred during breastfeeding and progestin-only contraceptives are preferred over combined oral contraceptives in breastfeeding women, especially during the first 4 weeks postpartum. For further information, consult the record entitled, "Contraceptives, Oral, Combined."