Someone with more pharmaceutical knowledge should reply, but when I was in college a guy on my dorm floor od'd on Tylenol (consumed a complete bottle). His fever went over 109 degrees, he had hallucinations and was convulsing. Was not pretty. Until that happened, I would never had guessed that a drug used to treat fevers and pain would do that.
Yelp, I tried that method. Put a plastic garbage bag over my head, and waited to die.
Later pulled the bag off my head went to the bathroom took a leak fell backward into the tub through the plastic shower doors. Mom heard me and asked if I was ok, I said I was fine. She said I am calling an ambulance. I told her fine call the $&#^ ambulance! Then I got er...somewhat combative with them. Police called, I was feeling berserk rage at everyone and everything. Had nice interaction with three cops. Hand-to-hand training works well even when out is of one's mind. When I came too in the hospital I was hogtied to the bed. Furious, and could feel where I had been busted in the mouth. When my treatments were over they had decided to ship me to a mental place. I am both pleased and delighted to state I escaped! When trying to confine me, do not blink. The guy who had me blinked. It was funny as hell watching that ass running about looking for me. POOF! Like smoke, I took to the ozone.
Wound up walking 22 miles back home. Mom was relieved. the mental people called my family, friends, workplace,.........everyone laughed at them and told them to f off. Not a method Id recommend.