http://www.medications.com/effect/view/34712 I was on synthroid for 10 years after getting treated with Radio Active Iodine. As the years went by my period was all all over the place. They were heavy the first three days and lasted 9 days or more days. I spotted all the way through the month. Othe Sun, 07 Dec 2008 08:45:57 +0000 http://www.medications.com/effect/view/34712?item=15090 After reading your comments as well as all the others, I was shockedto hear you talk about your teeth!!! I am taking synthroid 175mcg/day just for simple hypothyroidism but I believe that it is killing me. I tried to wean myself off a couple of weeks ago http://www.medications.com/effect/view/34712?item=15090