From a source that I believe we cannot post from - I found information that he had been given seretonin reuptake inhibitors, or SSRIs, as well. I understand that is a problematic combination.
This guy was a weird guy - he was a grown man who was apparently obsessed with the band Slipknot.
He was into some dark stuff.
I also suspect that his magically invented fake brain injury was a ploy for disability payments that went south.