In my opinion the main problem of the using of psilocybin, LSD and other psychedelics in medicine is unpredictable effect that depends on not only the status of a pacient but on entourage too. One time you have a good trip, but next time you get into TRUE HELL.
Recent research in to psychedelics has proven that we've learned how to control set and setting so that the overwhelming majority of people who do psychedelics with trained therapists have positive results.
Some people still have difficult experiences, but with the aid of properly trained therapists even those experiences can be constructive, and people can come out healed on the other side of even the worst trips.
I do not known such researches but I agree that it can work for some people, especially for suggestible people or who strongly trust in therapist. But in general we do not be able to control it. Any psy trip is similar to sailing in ocean.
It's not just about trust in the therapist. Music plays a huge role. In fact, I've recently heard a psychedelic researcher say that he now thinks of psychedelic therapy as a form of music therapy done with psychedelics.
It's also important to be in a safe, comfortable place, without people you don't intimately trust around, at a time when you can just focus on yourself on the day of the experience and ideally at least a day or two afterwards.
These are necessary but insufficient conditions. A bad trip may be triggered by a fleeting recollection/thought. I believe that a medical procedure cannot be based on such precarious approaches.
I haven't taken psychedelics in a therapeutic setting, but I have had a couple "PURE HELL" experiences, and those were still some of the most meaningful and instructive experiences I've ever had.
For anyone considering using psychedelics, consider that a "bad trip" might make you uncomfortable but it will also force you to confront your problems.
