FTR, ketamine is much more than a "horse tranquilizer" - it is used extensively in emergency rooms, for depression and neuropathic pain, and in general vetinary medicine. And of course, it has wide-scale use recreationaly.
I presume the "horse tranquilizer" moniker came about as some kind of anti-ketamine propaganda.
I presume the "horse tranquilizer" moniker came about as some kind of anti-ketamine propaganda.