I also don't have a period since upset thyroid but again don't know if it is my thyroid or my age I'm almost 50
From Waterhog
May take a few months -- the hypothyroid causes menstrual changes, not the meds.
I don't think the meds will, but being hypo can. I know hypo problems are usually shorter & heavier periods, but mine are longer apart or missing. They tend to regulate more if my TSH is where it should be.