Specific phobia of vomiting (SPOV), also called emetophobia, is a debilitating condition that shares features with several other anxiety disorders and obsessive-compulsive disorder (OCD). Approximately half of sufferers from SPOV do not fully benefit from current treatment modalities.

Bergen 4-day treatment (B4DT) is a highly concentrated form of exposure and response prevention developed for OCD. This case series reports on the first participants undertaking the treatment for SPOV.

Five female participants underwent the B4DT adapted to SPOV. The Specific Phobia of Vomiting Scale (SPOVI) and Emetophobia Questionnaire (EmetQ-13) were administered pre-treatment, post-treatment, and at 3- and 6-month follow-up. Participants were also shown a 27-minute video portraying vomit-related stimuli of increasing intensity at pre- and post-treatment. The time participants managed to watch the video and their subjective anxiety and nausea were assessed at regular intervals. Reliable and clinically significant change were calculated on SPOVI post-treatment and at 6-month follow-up.

Four of the participants achieved clinically significant change and the fifth reliable improvement, and these results were maintained at 6-month follow-up. The participants watched the vomit-related stimuli video for an average of 10 minutes pre-treatment whereas all completed it post-treatment, experiencing considerably less anxiety. These results were maintained at 6-month follow-up.

The B4DT may be a robust and time-effective treatment format for SPOV with low attrition rates, but further research is needed to verify this.