It reduces the number and severity of hot flashes due to menopause. It may also help relieve the symptoms of menopause, such as vaginal irritation, dryness, or pain during sex. It can be used to prevent osteoporosis after menopause.Common side effects Headaches. ... Breast pain or tenderness. ... Unexpected vaginal bleeding or spotting. ... Feeling sick (nausea) ... Mood changes, including low