When I was looking for the screenshot I posted above, I noted my surgery is now also using Airmid, as an adjunct to SystemOnline. When I looked at it in the App Store, I noted it included "messaging", which we have never had before, so downloaded it for a look.
Messaging has been disabled by the practise, and in some ways I can understand why, at this particular time, but it was certainly really very good for finding historic information. Medications are listed as "current" and historic, with the relevant notes appended to the historic entry which include the reason it was discontinued. Mine was just a reduction in my thyroxine dose, meaning I didn't need any 25mcgr tablets when I started Liothyronine.