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Moderate caution

Ibogaine and Diphenidol

Also known as: Difenidol, Vontrol, Difenidol Clorhidrato

Vestibular antimuscarinic antiemetic common in Mexico. QT prolongation and ventricular arrhythmia are reported in overdose; therapeutic-dose cardiac data are thin (grade provisional, physician to confirm). Its labelled hallucinations and confusion compound the ibogaine state.

Severity

Moderate caution

Mechanism

QT-interval prolongation

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 Diphenidol.

Physician decision only; not first line and not inside the noribogaine peak when another option serves. Lowest labelled dose, QTc on the monitor before the dose and again 1 to 2 h after it; below 460 ms routine, 460 to 499 ms the physician decides, at or above 500 ms or up 60 ms from the stay's baseline no further QT-prolonging antiemetic and the physician is called.

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

Last dose at least 24 hours before treatment.

Post-Treatment Restart

Restart at physician discretion once acute window closes.

The Pharmacology

How Diphenidol interacts with ibogaine: qt-interval prolongation.

Ibogaine and noribogaine block the cardiac hERG (IKr) potassium channel, which lengthens ventricular repolarisation and the QTc interval on a 12-lead EKG. Adding a second QT-prolonging drug compounds the effect and raises the risk of torsades de pointes, a polymorphic ventricular tachycardia that can be fatal. Every patient receives a baseline EKG, electrolyte panel, and continuous cardiac monitoring; medications in this class must be washed out long enough to return QTc into a safe range.

Same Mechanism

Other medications that interact via qt-interval prolongation.

Contraindicated

Citalopram

Celexa

Contraindicated

Escitalopram

Lexapro

Contraindicated

Amiodarone

Cordarone, Pacerone

Contraindicated

Sotalol

Betapace, Sorine

Contraindicated

Dofetilide

Tikosyn

Contraindicated

Dronedarone

Multaq

Same Severity Tier

Other moderate caution medications (different mechanism).

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

Cardiac conduction (bradycardia / AV node)

Verapamil

Calan, Verelan

Cardiac conduction (bradycardia / AV node)

Diltiazem

Cardizem, Tiazac

Common Questions

Diphenidol and ibogaine treatment.

Can I take ibogaine if I am on Diphenidol?

Moderate caution. Vestibular antimuscarinic antiemetic common in Mexico. QT prolongation and ventricular arrhythmia are reported in overdose; therapeutic-dose cardiac data are thin (grade provisional, physician to confirm). Its labelled hallucinations and confusion compound the ibogaine state. Physician decision only; not first line and not inside the noribogaine peak when another option serves. Lowest labelled dose, QTc on the monitor before the dose and again 1 to 2 h after it; below 460 ms routine, 460 to 499 ms the physician decides, at or above 500 ms or up 60 ms from the stay's baseline no further QT-prolonging antiemetic and the physician is called.

How long do I need to be off Diphenidol 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. Last dose at least 24 hours before treatment.

What is the mechanism of the interaction?

QT-interval prolongation. Ibogaine and noribogaine block the cardiac hERG (IKr) potassium channel, which lengthens ventricular repolarisation and the QTc interval on a 12-lead EKG. Adding a second QT-prolonging drug compounds the effect and raises the risk of torsades de pointes, a polymorphic ventricular tachycardia that can be fatal. Every patient receives a baseline EKG, electrolyte panel, and continuous cardiac monitoring; medications in this class must be washed out long enough to return QTc into a safe range.

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 Diphenidol. 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.

Browse all 176 medications in the A-Z directory.

DA
Medically reviewed by Dr. Arellano, M.D.
Clinical Director, MindScape Retreat · Board-certified physician specializing in ibogaine-assisted detoxification with over 1,000 patients treated.
Last reviewed: May 2026 · See full medical team
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