In a similar vein to carefully planning what will be attempted in the rebound timeframe, we also now carefully prune our expectations while off medication or waiting for it to kick in. Pick your battles.
We have given up on the idea that our 6.5yr old might be able to eat her breakfast unassisted or dress herself - a girl who could dress herself beautifully at 2yrs old (back when it was interesting to learn how to put clothes on the right way around and learn all the kinds of fastenings). We highly supervise or do for her until she takes her medication in the mornings and try very hard to not get impatient and angry at what she simply cannot do (ie actually look at the clothes she's putting on and do it correctly). Then she takes her medication and turns into a different child and it's much more reasonable to expect her to what she's been asked or to self manage.