If you are in surgical menopause and you still have a uterus (i.e. you did not have a hysterectomy as well as ovary removal), then you should take progestogen therapy as long as you are taking estrogen therapy, since it is important for protecting you against endometrial cancer.
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Visit www.iapmd.org/surgery for lots of evidence-based information and resources for those considering, going through or recovering from surgery for PMDD/PME.