ABBACUS,
While my response is a bit different that your question, I do think it addresses your problem, at least indirectly.
We own a PW Lexor which contains a three way 3 cuft fridge. For my wife's tastes, that was a bit small, and the freezer - well, it ain't much. So, I figured out a way to "add" an Engel fridge/freezer and it runs on either 12V or 120V. We use it only as a freezer, but it could be used as only a fridge - and use less power.
Though the "three way" factory fridge is relatively power hungry except on propane, the Engel is not. It's amazing how little power it uses. And, my wife now has the freezer space she wanted.
The Engel freezers come in various sizes and I'd suspect that for your DW's meds, a smaller one would suffice.
I've set up ours so that it runs off the engine (12V) when underway, 120V when plugged in to shore power, and I added a portable rechargeable battery to power it when boondocking. Then that battery recharges when either underway or plugged in. The "boondocking battery" carries the Engel overnight with ease, but I did a little testing to get that sized just right.
In your case, having a "backup" cooling source (i.e., RT fridge and a separate portable fridge/freezer) might offer some peace of mind.
Cheers.