Can I insist on medication for my mom?
The first thing you need to do is aks if your mom is on some other medications. Sleeping all the time and refusing food and liquids could be caused by advanced Alzheimer's disease, but it also could be due to medications. I do not think that Ativan would improve her current condition because you do not describe her as being anxious. If her condition is not aggravated by medications, she might be in a terminal stage of Alzheimer's disease and you might consider enrolling her in a hospice program.
