BackgroundIn recent years, the number of forcibly displaced persons has risen worldwide, with approximately 40% being children and adolescents. Most of them are hosted in low- and middle-income countries (LMICs). Many individuals meet the criteria for mental health issues, which can also be exacerbated by a number of risk factors, including low socioeconomic status, displacement, and stressors linked to conflicts in their country or region of origin. However, the vast majority never receive treatment for their psychological problems due to multiple reasons, including a shortage of mental health professionals in LIMCs, transportation challenges in accessing clinics, and clinic hours conflicting with family commitments. In the current study we investigated whether individual psychotherapy delivered by trained lay counsellors over telephone to Syrian refugee children living in Lebanon is effective and overcomes barriers to treatment access.MethodsAfter adaptation of Common Elements Treatment Approach (CETA) to remote delivery over telephone (t-CETA), preliminary effectiveness of the treatment modality was assessed with a pilot single blind randomised controlled trial including a total sample of 20 refugee children with diagnosed mental health problems. Data was analysed applying a Bayesian approach.ResultsThere was a significant session-by-session decrease in self-reported mental health symptoms over the course of treatment. Independent assessments showed that t-CETA resulted in a greater reduction of symptoms than standard in-person treatment as usual. There was no difference between groups for impairment. Importantly, the majority of children allocated to t-CETA completed treatment whilst no children in the treatment as usual condition were able to do so.ConclusionThe study provides preliminary evidence that telephone-delivered psychotherapy in a humanitarian setting, delivered by lay counsellors under supervision, works and significantly increases access to treatment compared to traditional in-person treatment. However, findings remain to be replicated in larger trials.Trial RegistrationClinical Trials. gov ID: NCT03887312; registered 22nd March 2019.