Hello, and i hope I can help you today. Noriday is a pill that contains the hormone progeesterone, which is normally present in the part of your menstrual cycle after ovulation. Normally this pill is prescribed as a method of contraception. A lack of estrogen around menopause is what causes hot flashes and there is no medical evidence that taking progesterone will help your hot flashes. In addition, progesterone taken daily will not regulate your menstrual cycle. Combination hormone replacement therapy, which contains both estrogen and progesterone, is more likely to help your hot flashes and regulate your cycle. Many physicians have you take a low dose of estrogen all month, and in addition, take a short course of progesterone for a week to 10 days a month to help give you a light, regular period. Women taking estrogen should have no history of breast or gynecologic cancer and have had a mammogram and GYN checkup in at least the year prior. There are also non-hormonal products that can help with hot flashes. Black Cohosh is an herbal supplement what has been shown to treat hot flashes. In addition, certain antidepressants and other prescription medications are also used to treat menopausal symptoms. So in summary, you can start the Noriday any time, but it may not help your symptoms. There are otherr products to treat hot flashes that may give you more relief as well as help regulate your cycle. I hope i was able to adequately answer your question today and that my advice was helpful. Best wishes, Dr. Brown