The advice I heard was to eat a mars bar. That ain't too difficult.
I don't. Trips can move gradually, and a therapist with the patient can move them in a positive direction. The remarkably positive results of these controlled tests indicate that yes, you can keep a person from having a bad trip if you have a trained guide with them.
Thorazine.
This can be dangerous, Xanax or klonopin are preferred by modern psychedelic therapists.