im no expert but that seems kinda high for replacement therapy.
I know of someone who is a female and only 140ish lbs and recently got a script for thyroid medication, and the prescribed dosage for her was 150 mcg and frequency is once a day.Does this tell you anything about half-life and dosage for bb's?
She is probably prescribed with 150mcg of T4 thyroxine that is usual therapy for underactive thyroid and not T3 triiodothyronine common ones used in bodybuilding.