Ibogaine has been associated with QT prolongation, a change in cardiac electrical timing that can increase the risk of serious arrhythmia. The FDA’s discussion of QT-related drug safety illustrates why medication effects on cardiac rhythm receive regulatory attention: a rhythm risk can be difficult to infer from how someone feels.
Existing heart disease, a history of fainting or rhythm problems, abnormal electrolytes, liver or kidney impairment, and other medical comorbidities may increase concern. A prior overview of the treatment context can help distinguish broad descriptions of ibogaine from the narrower question here: whether a specific person, product, and setting may carry avoidable risk.
“Natural” does not mean predictable, screened, or safe for every medical history.
Published case reports and reviews have repeatedly raised cardiac safety issues. They do not turn remote screening or informal reassurance into a substitute for individualized medical evaluation.