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Study identifier: NCT07189442 Synced from ClinicalTrials.gov · July 29, 2026
● Recruiting

L-theanine and Paraxanthine for Cognitive Improvement in Adults With ADHD and ASD

Condition: Attention Deficit Hyperactivity Disorder (ADHD) · Autism Spectrum Disorder (ASD)  ·  Sponsor: Texas Tech University Health Sciences Center

PhaseNA
Planned participants24
Who can joinMale, N/A to no upper limit
Healthy volunteersNo

About this study

This pilot study will test whether combining L-theanine and paraxanthine improves sustained attention, inhibitory control, and overall cognition in adults with ADHD and ASD. Two parallel randomized, single-blinded, repeated-measures crossover trials will be conducted. Participants will complete neuropsychological testing, fMRI scanning, and self-report measures following administration of the L-theanine-paraxanthine combination compared to placebo.

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

Talk to the study team

Chathurika S Dhanasekara, MD, PhD  ·  806-743-2378  ·  samudani.dhanasekara@ttuhsc.edu

Chanaka N Kahathuduwa, MD, PhD  ·  806-412-9974  ·  chanaka.kahathuduwa@ttuhsc.edu

Always discuss trial participation with your own doctor first.

Locations (1)

Texas Tech UniversityLubbock, Texas, United StatesRecruiting

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Source record: clinicaltrials.gov/study/NCT07189442