Much of today's news (other than something to do with Europe, Scotland, coal, ...) is filled with proposals for changing what medicines are available on prescription.
The top of the list is liothyronine. From the BBC report:
'Low value' medicines on the list and their annual cost to the NHS:
£30.93m on Liothyronine to treat underactive thyroid
What evidence is there that liothyronine should not be used?
There are perhaps 10% or more who have issues which seem to require liothyronine but the proposal would appear to be a blanket ban. (And would, I am sure, become a de facto ban even if the words don't actually say that.)