I have never seen an excessive dose given and would not tolerate it if it was. Food and water are always available but patients may not be able to take much in due to their condition drugs given to relieve pain and anxiety are a blessing but a lethal dose just for the sake of a lethal dose is a step too far.
That’s great. Maybe “nearly universal” was overstating it. As a non-medical person, my experience is only anecdotal, from what I’ve seen personally and heard from friends.