Yes, it is completely normal. A typical menstrual cycle can range anywhere from 21 to 35 days, so your 21-to-27-day cycle is well within a healthy, normal range. Your daily thyroid medication, Thyronorm (levothyroxine), works to balance your thyroid hormones, which actually helps regulate your menstrual cycle. It is a very reassuring sign that your body is responding well to the therapy. Please continue taking your medication as prescribed, and mention this to your doctor at your next routine check-up for peace of mind.
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Is it normal for my menstrual periods to occur every 21 to 27 days while I am taking the thyroid medication Thyronorm daily?