There is research conducted with eighty-seven participants were divided into a cognitive behavioral therapy group, hypnotherapy treatment group, and a supportive counseling group. Hypnosis combined with cognitive behavioral therapy performed best. Both treatments produced fewer participants qualifying for post-traumatic stress disorder than did supportive counseling. The group that received cognitive behavioral therapy while hypnotized had the least number of participants with renewed experiences of post-traumatic stress disorder symptoms during the six-month follow-up (Bryant, Moulds, Guthrie, & Nixon, 2005).
A two-group study was conducted on combat-related post-traumatic stress. There was a group on antidepressants and treated with psychotherapy, and the other group was treated with hypnotherapy as an adjunct to antidepressants. The hypnotherapy group was determined to show the greatest improvement (Abramowitz, Barak, Ben-Avi, & Knobler, 2008).
Abramowitz, E. G., Barak, Y., Ben-Avi, I., & Knobler, H. Y. (2008). Hypnotherapy in the treatment of chronic combat-related PTSD patients suffering from insomnia: A randomized, zolpidem-controlled clinical trial. Intl. Journal of Clinical and Experimental Hypnosis, 56(3), 270-280.
Bryant, R. A., Moulds, M. L., Guthrie, R. M., & Nixon, R. D. (2005). The additive benefit of hypnosis and cognitive-behavioral therapy in treating acute stress disorder. Journal of Consulting and Clinical Psychology, 73(2), 334.