djb you are confusing t3 with t4, thyroxine is t4 - as per the site (thanks for listing it):
Levothyroxine sodium (thyroxine sodium) is the treatment of choice for maintenance therapy. The initial dose should not exceed 100 micrograms daily, preferably before breakfast, or 25 to 50 micrograms in elderly patients or those with cardiac disease, increased by 25 to 50 micrograms at intervals of at least 4 weeks. The usual maintenance dose to relieve hypothyroidism is 100 to 200 micrograms daily which can be administered as a single dose.
In infants and children doses of thyroxine, for congenital hypothyroidism and juvenile myxoedema, should be titrated according to clinical response, growth assessment, and measurements of plasma thyroxine and thyroid-stimulating hormone.
Liothyronine sodium has a similar action to levothyroxine but is more rapidly metabolised and has a more rapid effect; 20 micrograms is equivalent to 100 micrograms of levothyroxine. Its effects develop after a few hours and disappear within 24 to 48 hours of discontinuing treatment. It may be used in severe hypothyroid states when a rapid response is desired.
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Note - this is only describing amounts needed for medical use - t3 is preferrable for BB uses due to rapid onset and shorter half life to elimination - thus controllable - but t4 can be used as well.
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