Anyone in the position of having their T3/liothyronine prescription stopped:
Ask for the doctor to provide an evidence-based protocol for switching from T3 to T4.
There is no reason whatsoever for accepting a straight swap. After all, with quite a number of medicines there are more or less strict tapering protocols to avoid or minimise problems. Why should anyone assume that a straight swap is optimum or without risks - without evidence?
If a doctor continues to insist, it is surely, at the very least, their personal responsibility?