Morphine/Heroin is supposed to physically cause respiratory depression so you stop breathing and I guess the CO2 builds up past the 30% blood saturation point b

Morphine/Heroin is supposed to physically cause respiratory depression so you stop breathing and I guess the CO2 builds up past the 30% blood saturation point by which stage it takes about 2 mins for the body to shut down. As the CO2 levels reach that 30% blood saturation point, the body becomes increasingly stimulated which is why you see people thrashing around when drowning or asphyxiating. Having done sea rescue to stop someone drowning in rough sea's, you can say goodbye to all the training water rescue people get taught and just hope the panicking person isnt as strong as you and hope your lungs are better than theirs, because they will force you under and you will ingest lots of water so you have CO2 build up which spurs you on to shore ironically. Obviously (going off things like trainspotting and peoples accounts), opiates are supposed to give you a warm fuzzy feeling as you slip into a deep sleep or unconsciousness I guess but not to sure, never done it not even in an operating theatre. MAOI's the old style anti depressants are quite sudden in that they are like an on off switch for the brain, you dont remember or feel nothing and I think they were popular with people who wanted to end it, but SSRI's have replaced them as the new anti depressant treatment but their problem is you dont sleep properly on them so they introduce their own problems, but I'm not aware of any end of life properties in SSRI's other than they ruin your sleep and send you off the rails slowly. But all the while, these chemicals still dont address the fundamental problem with depression which is remembering stuff that causes depression. Maybe depression should be treated more like PTSD, because depression seems to be an ego thing, where as talking to other people, PTSD seems to be more like what people associate as depression. For bloke's I think the bio mechanical properties of testosterone would help many with PTSD, cant comment for women though, but the risk the police and medical lot dont want is some hulk losing it so the idea isnt entertained AFAIK. Self preservation of institutions comes before everything else! Edit: I should add, once CO2 blood saturation exceeds 30% it has a noble gas effect on the body, so anyone who remembers the periodic table should remember what noble gasses are and its why compressed gas companies go to great lengths to not enable pure noble gases getting into the hands of the public. Biology and chemistry is just the mammalian equivalent of computer hacking.