underactive thyroid
"Synthroid saved my life....been taking it for almost four years now.  I had all of the worst symptoms in the worst way of a basically dead thyroid.  I was feeling better within a week of taking it and continued to feel better and better every day for about the next six months.  That's when it leveled off and I've been happy (and grateful) ever since. It took about a year or so to lose all of the weight I gained as a result of crummy thyroid. The weight just came right off after taking Synthroid. I'm on 225Mcg per day with very minimal side effects...so minimal that I can't recall what they are at the moment."