The Efficacy of a Pharmacological Treatment (Reboxetine Plus Ritalin) Versus Dog-Assisted Therapy in PTSD

Posttraumatic Stress Disorder (PTSD) is a chronic and debilitating psychiatric condition characterized by intrusive memories, avoidance behaviors, hyperarousal, and emotional numbing. It is estimated that it affects 5.3% of the Israeli general population, though following the October 7, 2023 terror attacks, probable PTSD nearly doubled, from 16.2% to 29.8%, highlighting the urgent national need for effective and scalable PTSD interventions.

Given its high prevalence and physical and mental consequences, adequate treatment is needed. Current first-line therapies (TF-CBT and EMDR) are effective but are time-intensive, require specialized clinicians, and are not suitable for all patients. Pharmacological interventions, particularly SSRIs yield partial response rates (~60%) and often cause adherence-limiting side effects (e.g., major changes in body weight or loss of sexual drive). These limitations underscore the need for novel, tolerable, and mechanistically targeted therapies.

Arising evidence suggests a correlation between sensory dysfunction, impaired attention, and PTSD symptoms. The importance of combined treatment specifically targeting these difficulties has been suggested by us. Recent evidence suggests that PTSD involves dysregulation in both noradrenergic and dopaminergic systems, which play critical roles in attention, arousal, and emotional processing. Reboxetine, a norepinephrine reuptake inhibitor (NRI), and methylphenidate, a dopamine-enhancing psychostimulant, are hypothesized to have synergistic effects on PTSD-related cognitive and emotional deficits. Our lab's prior results suggest that this combination is safe, well-tolerated, and effective in reducing both clinician-rated PTSD symptoms, and neurophysiological dysregulations related to sensory gating and attention regulation, sensory processing, participation and quality of life.

Animal-assisted therapies, and DAT in particular, are increasingly recognized for their potential to reduce PTSD symptoms and improve emotional regulation. DAT programs for US veterans diagnosed with PTSD were found to be a helpful complementary or alternative treatment option for the veterans, demonstrating signs of meaningful improvements in mental and social health, lower PTSD symptoms severity and higher psychosocial functioning in veterans owning a psychiatric service dog, and positive correlation between Animal-assisted interventions (AAI) and a reduction of posttraumatic symptomatology. DAT programs have also been shown to foster resilience among veterans and their families. A meta-review found that DAT was as effective as traditional psychotherapy in symptom reduction. Our lab conducted a controlled study involving adolescents exposed to interpersonal trauma, showing significant improvement in PTSD symptoms, depression, and attentional regulation after a year-long dog training program (also on the dogs' attention and anxiety-like behavior).

Despite growing support for DAT and emerging evidence comparing DAT to psychotherapeutic interventions for PTSD symptomatology, no studies to date have directly compared pharmacological vs. animal-assisted therapy in PTSD. Moreover, there is a lack of objective, physiology-based tools to monitor treatment efficacy and guide individualized care. This study aims to bridge both gaps, combining a novel pharmacological strategy with neurophysiological diagnostics in a rigorously controlled, head-to-head RCT. Therefore, a four-arm randomized controlled trial (RCT) involving 160 adults diagnosed with PTSD, allocated to one of the following groups: 1. Combined pharmacological treatment (reboxetine + methylphenidate) 2. Pharmacological placebo control 3. Dog-assisted therapy (DAT) 4. Active control: Occupational therapy (OT) The pharmacological arm is double-blinded and placebo-controlled, while the DAT/OT arms are open-label, with participant preference and suitability guiding allocation. The study includes repeated measurements at multiple time points, combining subjective and objective outcomes.

Inclusion criteria

• age between 18 and 70 years,
• diagnosed with PTSD according to DSM-IV or DSM-5 criteria,
• any psychotropic drug therapy that is being administered must be at a fixed dose for at least one month prior to the study initiation.

Exclusion criteria

• any health condition for which the use of reboxetine or methylphenidate is contraindicated,
• comorbidity with major psychiatric disorder,
• significant/active cardiovascular disease,
• previous or current severe traumatic brain injury,
• active substance dependency,
• participating in another treatment program for PTSD of any kind.