Non opioid medications disappeared in our home, I thought we should get a locking medication box. Family said try dispensing in plastic bags.

With my Mom I did her weekly pill planner. My nephew gave her the meds when needed. We put it on a cabinet shelf with the pill bottles, on a shelf she could not reach. She never saw where we put them.

An aide should not be handling medication. Someone else needs to do the pill planner. The aide then takes the planner to the client.

I doubt anyone is pilfering non-opioid meds but seems highly possible the LO w/dementia maybe found the stash and did something with it...hopefully didn't actually ingest any of it.

I don't think you need a locking med box unless you suspect theft. The carer responsible to dispense the meds should hide the box where the impaired LO can't find it -- and even the cognitively "stable" adult can't find it. This is because you don't know when the "stable" one starts to become impaired. You yourself stated this person "couldn't remember" if he removed the meds, so just have the distributor hide it really well from both of them. This is what I'd do.

Sounds like you might have to dole out the meds at the appropriate time, and secure everything else including any over the counter meds.

It sounds like there are too many cooks in this kitchen.

One person should decide what to do (set up locking pill box once a week) and stick to it.