Do I need  T4 at all?
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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. I have been on T3 only for nearly 4 years and don't miss T4 at all. (updated 12/12).

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.