Design of a randomized clinical trial of brief couple therapy for PTSD augmented with intranasal oxytocin

Background: Leveraging military veterans ' intimate relationships during treatment has the potential to concurrently improve posttraumatic stress disorder (PTSD) symptoms and relationship quality. Cognitive -Behavioral Conjoint Therapy (CBCT) and an 8 -session Brief Cognitive -Behavioral Conjoint Therapy (bCBCT) are manualized treatments designed to simultaneously improve PTSD and relationship functioning for couples in which one partner has PTSD. Although efficacious in improving PTSD, the effects of CBCT on relationship satisfaction are small, especially among veterans. Intranasal oxytocin, which targets mechanisms of PTSD and relationship quality, may enhance the efficacy of bCBCT. Method/design: The purpose of this 4 -year clinical trial is to compare the outcomes of bCBCT augmented with intranasal oxytocin versus bCBCT plus placebo. We will also explore potential mechanisms of action: selfreported communication skills, empathy, and trust. We will recruit 120 dyads (i.e., veteran with PTSD and their intimate partner) from the VA San Diego Healthcare System. Veterans will be administered 40 international units of oxytocin ( n = 60) or placebo ( n = 60) 30 min before each of 8 bCBCT sessions delivered via telehealth. Clinical and functioning outcomes will be assessed at five timepoints (baseline, mid -treatment, post -treatment, and 3- and 6 -month follow-up). Conclusion: Study findings will reveal the efficacy of oxytocin-assisted brief couple therapy for PTSD, which could serve as highly scalable option for couples coping with PTSD, as well as provide preliminary evidence of interpersonal mechanisms of change. ClinicalTrials.gov Identifier: NCT06194851