A central safety concern
Cardiac electrophysiology is not a minor detail
Ibogaine is associated with QT interval prolongation, a change in cardiac electrical recovery that can increase vulnerability to dangerous ventricular rhythm disturbances in some circumstances.
Published reports and mechanistic work have raised concern that ibogaine can affect cardiac ion channels, including pathways relevant to repolarization. A prolonged QT interval is clinically important because it can be associated with torsades de pointes and other potentially life-threatening arrhythmias; the FDA’s discussion of QT-related abnormal rhythms describes why drug-associated electrical changes warrant attention.
Risk is unlikely to be explained by one factor alone. Pre-existing heart disease, electrolyte abnormalities, other QT-prolonging substances, dehydration, vomiting, metabolic differences, and uncertain product composition may all matter. For broader context on pharmacology and effects, the site’s explanation of ibogaine’s mechanisms and effects distinguishes biological hypotheses from established safety conclusions.