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In a nutshell NO. T4 is a storage hormone also known as a "pro-hormone"
who's sole function is the building block that T3, the bio-active hormone, is made
from. There are people who have been on T3 only for 20 years without ill effects.
It is VERY important once you are on T3 to stay on it or change very gradually onto
something else. If you suddenly stopped taking T3 (for over a week with no replacement
other wise) you could go into myxedema coma
THEORETICALLY, though we have never heard of this happening. It's well worth
carrying a medical warning note that you are on T3 and the dosage in case you
are rendered unconscious in a car accident. Most people that still have a thyroid
would quickly get some T4 and thus T3 from their own thyroid but a thyroidless or
otherwise totally dependent person should never stop T3 treatment even for a day.
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