The pharmacy advise me that NDT (or, at least the one they supply) is more stable than thyroxine and therefore doesn't require refrigeration, though it is fine to do that. "Room temperature" is good. (And I believe room temperature is deemed to be 25C? Though I didn't ask them that.) It does get warmer than that in our house in summer and I do keep it in the fridge, except for measuring out a week at a time into my weekly pillbox - that weekly pillbox sits out for the week.
I'm going on a road trip and am now wondering about keeping it cool for travel. It isn't likely to be warmer than 25C (and at times quite cool - about -5C), but on a sunny day the car can get much warmer than the outside temperature.
I have a soft sided insulated lunchbox and I'll usually have access to a freezer to freeze ice bricks, so maybe that's all I need to do? Any thoughts?