Yes, it would require a special prescription.
However, the way T3 works, it would only confer a small advantage. T3 is quickly absorbed into tissues. It is not protein bound and carried around for a longer time period like T4 is.
T4 is designed biologically thru evolution to be a "backup" and standby, as part of the biofeedback process.
Too much T3, will over stimulate tissues over time, and lead to side effects, like bone loss, and cardiac stimulation. Too much thyroid is a factor in osteoporosis.
A sustained release form of T3, would slow the absorption down a little each day. But it too is not perfect. I don't think any of our thyroid treatments are "perfect" yet.
http://www.drugs.com/pro/cytomel.html
Quote:
Since liothyronine sodium (T3) is not firmly bound to serum protein, it is readily available to body tissues. The onset of activity of liothyronine sodium is rapid, occurring within a few hours. Maximum pharmacologic response occurs within 2 or 3 days, providing early clinical response. The biological half-life is about 2-1/2 days.
T3 is almost totally absorbed, 95 percent in 4 hours. The hormones contained in the natural preparations are absorbed in a manner similar to the synthetic hormones.
Liothyronine sodium has a rapid cutoff of activity which permits quick dosage adjustment and facilitates control of the effects of overdosage, should they occur.
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Weezie looking at petunias 8.25.2017
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