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Synthroid dosage

Is synthroid dosage based solely on body weight or on TSH?

I ask because I wonder what dose I will need to get a TSH of 40 down to 2 or 3 if I weigh 160?

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649848 tn?1534633700
While an initial dosage be weight based, the ending dosage shouldn't be based on either.  It should be based on FT3 and FT4 levels, as well as symptoms.

You should not be worried about your TSH, you should be worried about your FT levels.
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Avatar universal
I don't think it is base on weight.

I am 105 lbs and take 175mcg
husband is 220 and is on 75mcg.
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649848 tn?1534633700
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