Nausea, vomiting, difficulty sleeping, impaired coordination, fatigue, and intense perceptual experiences are often mentioned in discussions of ibogaine. These descriptions do not establish what any individual will experience, how severe it may be, or whether a symptom has a benign explanation.
What matters is the whole pattern: timing, pre-existing conditions, other substances, hydration, supervision, and access to urgent care can all affect what a symptom means. The Wikipedia overview of ibogaine notes both its psychoactive nature and its history of use in addiction-related contexts, but a broad overview cannot substitute for individual assessment.
Longer-lasting concerns should not be collapsed into a simple after-effects category. For a focused discussion of questions that may continue beyond an acute experience, see the material on long-term ibogaine side effects.
When a substance can affect consciousness, coordination, and heart rhythm, uncertainty itself is a safety-relevant fact—not a gap to fill with reassurance.