Hi thanks for your question.
value was very high T3 is low and T4 is normal and 100mg of thyrox
at the begning is right and not high.Dose can be latter tappered depending upon the response and level of TSH.Normalization of TSH will not cause increase in weight.Infact hypothyroid causes increase in weight and normalization of TSH will cause decrease in weight. Your TSH levels is now almost normal and dose can be now decreased.Reconsult your Doctor who may decrease the dose..
Hope this answers your question.