Thank you, Irondork for bringing this to light!
Yes, it can be dangerous. I should know, I have been through it, including electroshock (ECT). In the end, it just doesn't work, and many times people end up just as confused if not moreso than before the "Cure". And you are right, the self harm that it sometimes causes can be very damaging, not only emotionally, but physically. My body will never be the same.