Fig. 2: Flow Diagram for Clinical Trial Design with Indication of EEG Measurement Timepoints.

The phase 2a trial evaluating BPN14770 (Zatolmilast) utilized a cross-over design and enrolled 30 individuals with FXS. The 30 were then randomized into two groups and the first (baseline) EEG measurement was taken during screening. During period 1, half received BPN14770 and the other group received placebo. After period 1, another EEG was taken and was either the drug condition or placebo condition EEG measure depending on group. During period 2, the groups switched, and they received whichever intervention conditions they had not received in period 1. After period 2, the final EEG measurement was taken. Made with BioRender.