I've also taken Synthroid for many years and it should help you lose weight because you have a sluggish thyroid to begin with. The synthroid help to get your TSH back in an acceptable range. Not sure why you are gaining weight instead of losing...it doesn't really make much sense. Possible that your dosage isn't quite correct and I'm really not sure how long it takes for the medication to work in your system. It has never really affected my weight loss no matter what kind of diet I've been on. You may want to consult with your family doc or band doc on this one.

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Surgery date: 04/10/09
Lost 43 lbs. before initial consult