I've had a lot of success with this for things like closing doors and taking medication, as my memory gradually wanders off into the misty lagoon. Especially the “as needed but at most once every 24 hours” kinds of medication that can't be handled with a pill organizer—with the timing information included in the call. Point to the bottle (or if out of range, hold the pill up, or otherwise physically emphasize the object), say “Taking a symptomstoppidine on Thursday morning” or such.