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Study identifier: NCT03094429 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

An Adaptive Phase II/III, Two-Part, Double-Blind, Randomized, Placebo-controlled, Dose-Finding, Multi-center Study of the Safety and Efficacy of NaBen®, as an Add-on Therapy With Clozapine, for Residual Symptoms of Refractory Schizophrenia in Adults

Condition: Refractory Schizophrenia  ·  Sponsor: SyneuRx International (Taiwan) Corp

PhasePhase 2/Phase 3
Planned participants287
Who can joinAll sexes, 18 Years to 55 Years
Healthy volunteersNo

About this study

This is an adaptive, Phase II/III study in 2 parts (i.e. Part 1 (dose ranging) and Part 2 (Hypothesis testing)). NaBen® is granted Breakthrough Therapy Designation by US FDA as treatment for refractory schizophrenia. Part 1 Objectives: There are two primary objectives for Part 1 of this study: 1. To evaluate, in terms of dose-response, the effectiveness of NaBen® (1000 and 2000 mg/day) compared to Placebo (0 mg/day), when combined with clozapine, in improving the residual symptoms associated with refractory schizophrenia in adults, and; to determine the optimal dose to be used in Part 2 of this study. 2. Sample size re-assessment to evaluate the final sample size needed to proceed with Part 2 of the study The secondary objective of the Part 1 of this study is to evaluate the safety and tolerability of NaBen® (1000 and 2000 mg/day) compared to Placebo (0 mg/day), in combination with clozapine. Part 2 Objectives: The primary objective of the Part 2 of this study is to evaluate the effectiveness of NaBen® (at the optimal dose determined in the Part 1 of this study) compared to Placebo (0 mg/day), when combined with clozapine, in improving the residual symptoms associated with refractory schizophrenia in adults. The secondary objective of the Part 2 of this study is to evaluate the safety and tolerability of NaBen® (at the optimal dose determined in the Part 1 of this study) compared to Placebo (0 mg/day), in combination with clozapine.

This description comes directly from the study's public registry record.

Talk to the study team

Yashar Salek, MD  ·  1-301-956-2527  ·  yashars@amarexcro.com

Felicia Yao  ·  886-2-77422699  ·  felicia.yao@syneurx.com

Always discuss trial participation with your own doctor first.

Locations (1)

For additional information regarding investigative sites for this trial, contact SyneuRx International Corp.Pasadena, California, United StatesRecruiting

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Source record: clinicaltrials.gov/study/NCT03094429