This open-label trial (n=10) will examine low-dose psilocybin as a safe treatment alternative for Fragile X Syndrome (FXS), aiming to improve markers of cognition, communication, mood, behaviour, neuroinflammation, serotonin levels in exosomes, and neuroplasticity.
Phase II, open-label, single-group feasibility study of low-dose psilocybin (1.5 mg capsules) administered every other day for 28 days in adults with Fragile X syndrome (n=10).
Assessments include clinician- and caregiver-reported measures (VABS-3, CGI-I, ADAMS, VAS-TS), cognitive tests (NIH-TCB, TMT, MET), safety monitoring (DOA, ECG, vitals) and biomarkers (saliva/buccal swabs, neuroinflammation and serotonin markers in exosomes).
Drug dispensed in blister packs weekly; adherence monitored, unused study medication returned at visits; subjects attend visits at baseline and days 8, 15, 22 and 28.
Open-label single-group microdosing regimen: 1.5 mg capsule every other day for 28 days.
One 1.5 mg capsule on days 1,3,...,27; blister packs dispensed weekly; no more than five capsules (7.5 mg) dispensed at a time; skip missed doses.