is charecterised by raised TSH levels & normal levels of T3 & T4. Since your TSH level is in the normal range there is no need for thyroxine
is an enzyme inducer (increases the metabolism
of drugs). It definetly increses the metabolism of thyroxine At the same time it is also an autoinducer (increases its own metabolism). So there is no need for concern. But, carbamazepine may possibly aggravate the preexisting hypothyroidism, So pl check your thyroid status once in every two months as you are taking carbamazepine.