Hello – TSH that is out of range on the low side is associated with hypERthyroidism. If TSH is low, but T3/T4 are normal, that is referred to as “subclinical hyperthyroidism”. So the doc is reducing your meds to try and get the TSH back up into the normal range.
Subclinical hyper can be associated with an increased risk of bone loss and heart issues, so that is why docs will recommend a reduction in meds if they see the TSH drop out of range low. Of course, your doc should be taking your symptoms into account as well.
We hear mixed reviews from patients who try combination T3/T4 therapy. Some believe it did improve their quality of life, while others found that it brought back their old hypER symptoms.