Ketoconazole
Nizoral
Ibogaine and Grapefruit Juice
Also known as: Grapefruit
Furanocoumarins in grapefruit irreversibly inhibit intestinal CYP3A4, raising plasma levels of many co-medications (including some QT-prolonging drugs) and altering predictable kinetics during ibogaine dosing.
Severity
Moderate caution
Mechanism
CYP3A4 metabolism overlap
Protocol Status
Pre-arrival washout (under your prescribing physician)
Restart Delay
Physician discretion
What "Moderate caution" Means
Use with caution. Often requires a brief hold, dose reduction, or enhanced monitoring rather than full discontinuation.
Clinical Action
What our medical team does for patients on Grapefruit Juice.
Avoid grapefruit and grapefruit juice for minimum 3 days before treatment and during the active dosing window.
Where the Washout Happens
Pre-arrival washout (under your prescribing physician)
Discontinuation is completed before arrival, under the patient's own prescribing physician, with the medication-specific washout interval observed before the flood dose.
Pre-Treatment Washout Window
3 days minimum before treatment.
Post-Treatment Restart
Restart at physician discretion once acute window closes.
The Pharmacology
How Grapefruit Juice interacts with ibogaine: cyp3a4 metabolism overlap.
CYP3A4 is the second major hepatic clearance pathway. Strong CYP3A4 inhibitors (some antifungals, macrolides, and protease inhibitors) extend the elimination of ibogaine and several co-medications, while strong inducers can cause sub-therapeutic exposure. Either direction destabilises a treatment that depends on tightly controlled plasma kinetics.
Same Mechanism
Other medications that interact via cyp3a4 metabolism overlap.
Same Severity Tier
Other moderate caution medications (different mechanism).
QT-interval prolongation
Ondansetron
Zofran
QT-interval prolongation
Azithromycin
Zithromax, Z-Pack
Cardiac conduction (bradycardia / AV node)
Metoprolol
Lopressor, Toprol
Cardiac conduction (bradycardia / AV node)
Atenolol
Tenormin
Cardiac conduction (bradycardia / AV node)
Propranolol
Inderal
Cardiac conduction (bradycardia / AV node)
Carvedilol
Coreg
Common Questions
Grapefruit Juice and ibogaine treatment.
Can I take ibogaine if I am on Grapefruit Juice?
Moderate caution. Furanocoumarins in grapefruit irreversibly inhibit intestinal CYP3A4, raising plasma levels of many co-medications (including some QT-prolonging drugs) and altering predictable kinetics during ibogaine dosing. Avoid grapefruit and grapefruit juice for minimum 3 days before treatment and during the active dosing window.
How long do I need to be off Grapefruit Juice before ibogaine treatment?
Pre-arrival washout (under your prescribing physician). Discontinuation is completed before arrival, under the patient's own prescribing physician, with the medication-specific washout interval observed before the flood dose. 3 days minimum before treatment.
What is the mechanism of the interaction?
CYP3A4 metabolism overlap. CYP3A4 is the second major hepatic clearance pathway. Strong CYP3A4 inhibitors (some antifungals, macrolides, and protease inhibitors) extend the elimination of ibogaine and several co-medications, while strong inducers can cause sub-therapeutic exposure. Either direction destabilises a treatment that depends on tightly controlled plasma kinetics.
Can I switch to a different medication so I can have ibogaine treatment?
In many cases yes. Our medical team works with your prescribing physician to taper or substitute medications safely before treatment. The right substitution depends on the underlying condition you are treating with Grapefruit Juice — contact us for an individual review.
Checking more than one medication? Use the interactive Drug Interaction Checker to screen your full medication list at once.
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DA
Medically reviewed by Dr. Arellano, M.D.
Clinical Director, MindScape Retreat · Board-certified physician specializing in ibogaine-assisted detoxification with over 900 patients treated.
Last reviewed: May 2026 · See full medical team