Ibogaine-Induced Bradycardia and U-Waves
Yes, ibogaine can induce bradycardia, and this is well-documented in both preclinical and clinical studies 1, 2, 3, 4. However, the evidence specifically supporting prominent U-waves is limited in the available literature.
Bradycardia Evidence
The cardiovascular toxicity of ibogaine is clearly established:
- Preclinical data from 2000 demonstrated that ibogaine causes bradycardia at high doses in animal models 1
- Clinical observational studies confirm bradycardia as a consistent adverse effect in humans receiving ibogaine for opioid use disorder 2
- Case series from the UK National Poisons Information Service (2012-2022) identified bradycardia as one of the most frequently reported cardiotoxic features in ibogaine exposures 3
- Recent developmental toxicity studies (2026) showed ibogaine induced early-onset bradycardia at concentrations as low as 100 ng/mL in zebrafish models, indicating dose-dependent cardiac effects 4
The bradycardia appears to be dose-related and occurs alongside other serious cardiac manifestations including QTc prolongation, torsades de pointes, and cardiac arrest 2, 3, 5.
U-Wave Evidence Gap
The available evidence does not specifically document prominent U-waves as a characteristic finding with ibogaine toxicity. The predominant electrocardiographic abnormality consistently reported is QTc prolongation, with maximum prolongations averaging 95ms (range 29-146ms) and 50% of subjects reaching QTc >500ms 2. This QTc prolongation can persist beyond 24 hours post-ingestion and predisposes to life-threatening ventricular arrhythmias, particularly torsades de pointes 2, 3, 5.
Clinical Context
The cardiovascular monitoring recommendations for ibogaine focus on:
- Continuous ECG monitoring for QTc interval changes
- Heart rate and blood pressure monitoring
- Recognition that cardiotoxicity can occur even at therapeutic doses and in individuals without pre-existing cardiac conditions 5
If you need to cite bradycardia specifically, use 1, 2, 3, 4. However, for prominent U-waves, the current evidence base does not provide adequate support for this specific ECG finding with ibogaine toxicity.