how to get into a self induced coma from which you will never wake? So basically braindead and a hospital could safely harvest your organs to those who need it badly. I guess you need to do some planning and have the emergency number running after a while automatically. Could anyone here come up with a high secure plan for this to succeed?

So not a failed suicide attempt, that would be embarrassly cringe.

Pentobarbital overdose? Will hospital workers be able to put one into a coma or will this totally stop the heart with no reverse?

I've also read two ncbi papers that were able to put people who shot themselves into the head in a vegetive state for organ harvesting but shooting oneself in the head is probably not the best idea if the end goal is survival of the body long enough for kidney, lung, or heart harvesting.