Pharmacology and duration
A prolonged risk window can complicate assumptions
Ibogaine is metabolized in part to noribogaine, an active metabolite that may persist longer than the parent compound. This matters because acute subjective effects may fade before every relevant biological effect has resolved. The timing and intensity of risk cannot be inferred reliably from how a person feels.
Available pharmacology literature describes complex activity across several receptor and ion-channel systems. In particular, laboratory findings involving cardiac ion channels offer a plausible mechanism for QT-related concern, but they do not yield a simple individual risk calculation. For background on how drug metabolism can vary between people and exposures, see the NCBI overview of cytochrome P450 drug interactions.
Longer-term uncertainty is also part of the picture. Questions about lingering physical or psychological effects are distinct from the acute period; the discussion of possible long-term side effects addresses why a delayed change should not automatically be attributed to one cause without careful assessment.