Plasma Oxytocin Changes in Response to Low-dose MDMA vs. Placebo in Patients With Arginine Vasopressin Deficiency and Healthy Controls

MDMA will be administered in a single dose of 50 mg (2 capsules of 25 mg MDMA) or 25mg (1 capsule of 25 mg MDMA, 1 capsule containing only mannitol filler) and given at treatment visit.

Placebo will be prepared as identical gelatin capsules containing only mannitol filler and given at treatment visit.