Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Regestrone tablet is a synthetic form of progestin (norethisterone) and has a similar action to the female hormone, progesterone. It is used to treat menstrual disorders and abnormal vaginal bleeding in women caused due to hormonal imbalances. This medicine is not recommended for use in breastfeeding women unless absolutely necessary, and should be used only if benefits outweigh the risks. However, literature suggest that this dose of norethisterone may reduce the quantity of breastmilk, and there seems to be no risk to the breastfeeding baby of a short course of medication at this dose. Expert opinion holds that the risks of progestin-only contraceptive products usually are acceptable for nursing mothers at any time postpartum. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ashakiran. S.