[codemog]

What are you hoping to get out of asking this question? It sounds like you already know the answer.

[ido]

I don't know, that's why I'm asking! If I'm in that situation I hope this option is available to me, and want to know what to ask for.

If the answer is that it's illegal I'd know I can't ask this directly/explicitly (but maybe there's a "secret handshake" way of asking for it). If it is I'd know I can. I wish no harm to OP.

[freedomben]

See https://news.ycombinator.com/item?id=48878167

IANAD but have paid close attention to this for the same reasons. When my time comes I plan to let them know I'm in serious pain and prefer pain relief to life extension (though maybe in a more subtle way). I expect most will understand that.

[warshinder]

I believe it varies by state but typically must be administered by a doctor or hospice nurse.