I've only had it once decades ago. It was my first time on a psych unit I had just been transferred over from the ICU where I'd been for 3 days after an attempt, was underweight and had had nothing by mouth for 4 days and the Hadoop knocked me out. Literally I was unconscious for a couple hours. It wasn't nessasary but they gave me no choice, it was either drink the shot or they would inject it. I've stayed away from it ever since. But I've heard from some people that they had good results from it and liked it better than the newer stuff.