This evening I had reason to check on the amount of Liothyronine (T3) prescribed over the past few years.
The rate of prescription of liothyronine is rising. At least according to the NHS' Prescription Cost Analysis (which happens to accord with my perception):
(Figures ignore 'specials' such as Cytomel or Paddock brands imported from the USA. Covers only 20mcg Liothyronine and the previous branded Tertroxin - which are the same thing.)
Interesting that it is steadily rising each and every year.
Image is a Clearfin lionfish