T198. CAN AUGMENTED SUBLINGUAL OXYTOCIN DECREASE NEGATIVE SYMPTOMS WITHIN TREATMENT RESISTANT SCHIZOPHRENIC POPULATIONS: A PILOT STUDY

Abstract

Background: The prevalence of schizophrenia in the United States ranges between 0.5% and 1%. This difficult-to-treat disorder is marked by the presentation of symptoms that are both positive (i.e. hallucinations) and negative (i.e. blunted affect), as well as disturbances in cognition and affect. Several second-generation antipsychotics (i.e. olanzapine, risperidone.) have been utilized for their varying effects on the symptoms of schizophrenia, yet 20% to 60% of patients with schizophrenia are considered treatment-resistant. While clozapine is shown to be the most effective antipsychotic, negative symptoms commonly persist in clozapine-treated patients. Research shows that oxytocin has neuromodulatory effects on social perception and enhances empathy and attentional engagement in individuals with schizophrenia, suggesting it may have therapeutic effects on negative symptoms. The present study presents a pilot prospective research study evaluating the efficacy of combining clozapine and sublingual oxytocin for the reduction of positive and negative symptoms. Methods: Prospective research study evaluated 25 treatment resistant schizophrenic patients who were admitted to the persistent psychotic disorder unit at a private hospital, with an average treatment duration of 2.9 months with a range between 1 and 9 months. All have been followed as outpatient for up to 30 months after discharge. All patients were 18 years or older and met the DSM-5 criteria for schizophrenia. The Positive and Negative Syndrome Scale (PANSS) was used to assess the efficacy of the combination treatment. Clozapine was prescribed to all 25 patients after they had failed to improve in three different trials of other antipsychotic medications. Sublingual oxytocin (10 IU 2x per day; 20 IU 3x per day) was prescribed to 25 of the patients only after the improvement in positive symptoms on the PANSS with clozapine had plateaued. Due to a history of intranasal substance use in all the patients, oxytocin was administered sublingual to ensure adequate and less variable absorption of the neuropeptide. Results: A time-series analysis demonstrated a significant decrease in PANSS scores across admission, stabilization of clozapine and stabilization of oxytocin (p