Ibogaine Flood Dose Treatment: What It Means and How It Works

If you’ve been researching ibogaine treatment, you’ve probably come across the term “flood dose.” It comes up constantly — but it’s rarely explained clearly. What does it mean? How is it different from other doses? Is it safer or more dangerous? And is it the right approach for addiction treatment?

This guide explains everything you need to know about ibogaine flood dosing — what it is, how it works, what the experience is like, and how treatment centers calibrate the dose to each individual patient.

What Is a Flood Dose?

An ibogaine flood dose is a single, high, weight-based dose of ibogaine given in a medically supervised setting, intended to interrupt opioid withdrawal and produce a full, extended visionary experience lasting roughly 24–36 hours. The dose is set by the treating physician. In the largest prospective study, 30 patients received a mean total of 1,540 mg of ibogaine HCl, with wide variation between people (Brown & Alper, 2017).

This is distinct from lower “maintenance” or microdoses, which some programmes use after treatment. The evidence for those is anecdotal; see ibogaine microdosing for what is and isn’t known.

In addiction programmes the flood dose is the standard approach, because the reported interruption of opioid withdrawal comes from full-dose treatment. No controlled trial has yet compared it with lower doses.

How Is the Flood Dose Calculated?

The flood dose is weight-based and is set by the treating physician after screening, not from a formula. It is expressed in milligrams per kilogram of body weight, and published programmes report wide variation between patients.

But the actual dose protocol varies significantly by:

• The form of ibogaine used: Pure ibogaine hydrochloride (HCl) is the most potent and most precisely dosed. Total alkaloid extract (TA) contains other alkaloids alongside ibogaine and requires a different calculation. Ceremonial root bark is the least precise and not typically used in clinical settings for addiction treatment.
• The patient’s history: Opioid-tolerant patients may metabolize ibogaine differently.
• The clinical protocol: Some clinics split the dose — a test dose followed by the main dose — to monitor tolerance and cardiac response before proceeding. Others administer a single full dose in a medically supervised setting with immediate cardiac intervention capacity.
• Individual cardiac and metabolic factors: Slower metabolizers (often identifiable via CYP2D6 genetic testing) process ibogaine more slowly, which affects both the intensity and duration of the experience.

A reputable clinical program will not apply a one-size-fits-all flood dose. Your protocol will be calibrated based on your weight, medical history, current drug use, and cardiac screening results.

Why Is the Flood Dose Used for Addiction?

Clinics use a full dose because the reported interruption of opioid withdrawal comes from full-dose treatment in medically supervised settings. No controlled trial has yet compared different dose levels head to head.

What the research reports, and what it does not:

Opioid Withdrawal Relief

In the largest prospective series (Brown & Alper, 2017, 30 patients, open-label), mean opioid withdrawal scores fell from 31 to 14 within about three days, and half the patients reported no opioid use in the month after treatment. An open-label series of 191 patients treated under medical monitoring (Mash et al., 2018) also reported reduced withdrawal and cravings. Neither study had a control group.

What the GDNF Research Shows

GDNF (glial cell line-derived neurotrophic factor) supports dopamine neurons. In rats, ibogaine increased GDNF in a midbrain reward region, and blocking GDNF there cancelled ibogaine’s effect on alcohol intake (He et al., 2005). That is an animal finding: GDNF has not been measured in people treated with ibogaine, so how much it contributes to reduced cravings in humans is not known.

Full Visionary Experience

At a flood dose, most people describe 8–12 hours of vivid, autobiographical and symbolic inner experience, and many say that processing this material was central to what changed for them. Whether the visionary state is necessary for the benefit, or a side effect of the dose that produces it, has not been tested.

The Flood Dose Experience: What to Expect

Understanding what the flood dose actually feels like is essential preparation for anyone considering ibogaine treatment. The experience is unlike any other psychedelic — longer, more internally focused, and more demanding.

Onset (Minutes 0–60)

Within 30–60 minutes of ingestion, most people notice a low-frequency buzzing or vibration in the body. Nausea is common in this window and is managed by clinical staff. Movement becomes difficult — ataxia (loss of coordination) develops as the ibogaine takes effect. Sound and light sensitivity increases. This is the signal that the experience is beginning.

Acute Phase (Hours 1–8)

The full visionary experience emerges. Behind closed eyes, most people see highly realistic, cinematic narratives — often autobiographical, often drawn from deep memory. The experience is characterized by emotional clarity rather than confusion: things feel important, true, and visible in a way they normally aren’t.

For people being treated for addiction, this phase often involves direct encounter with the emotional origins of their drug use — the trauma, the need, the pattern. Many describe seeing themselves from a third-person perspective: watching their own life as if it were a film, with unusual emotional distance and insight.

Physically, the body is largely still during this period. Movement is not recommended. Clinical staff monitor continuously — particularly cardiac rhythms, which ibogaine temporarily affects.

Evaluation Phase (Hours 8–20)

The intense visionary content begins to subside. The mind becomes quieter and more reflective. Many people experience a profound stillness — often described as the first quiet they’ve felt in years. Integration begins organically: the mind starts making sense of what it encountered in the acute phase.

For opioid-dependent patients, this is also the point at which the absence of withdrawal becomes undeniable. The physical misery that accompanied arrival has resolved.

Residual Phase (Hours 20–36)

The experience gradually winds down. Most people are awake — ibogaine is a stimulant in its later phases and sleep is difficult. Sensitivity remains heightened. Thoughts tend to be clear, calm, and insightful. Many people want to write or talk about what they experienced.

This phase transitions into the post-treatment “afterglow” — a period of unusual clarity and openness that can persist for days to weeks.

If you or someone close to you needs help right now, SAMHSA’s national helpline is free, confidential and staffed 24/7 on 1-800-662-HELP.

What Screening and Monitoring a Flood Dose Requires

The flood dose is the part of the protocol that makes the medical infrastructure around it matter. Everything below is standard at a properly run clinic, and its absence is the clearest warning sign there is.

What that looks like in practice:

• A full work-up including an EKG before a flood dose is administered, with results reviewed by a clinician
• Continuous medical monitoring throughout the experience
• IV access, emergency medications and equipment on-site, and a written hospital-transfer plan
• A medication review beforehand, with tapering where it is needed — and honest exclusion of anyone the screening shows is not a safe candidate

A flood dose belongs in a supervised medical setting with that infrastructure in place. It does not belong in a non-clinical setting, and it is never something to attempt alone.

Not sure your medications or health history would clear screening? Tell an advisor what you take and we will explain which vetted clinics would accept you and what a supervised transition usually involves. Ask an advisor about screening or call or text (866) 435-7057.

Ibogaine HCl vs. Total Alkaloid Extract — Which Is Used for Flood Dosing?

Both forms are used at reputable clinics, and each has distinct characteristics:

For addiction treatment — especially opioid detox — ibogaine HCl is generally preferred because the precise dosing allows clinicians to calibrate the flood dose with greater accuracy and manage cardiac monitoring parameters more reliably.

After the Flood: What Happens Next

The flood dose is the beginning, not the end, of treatment. What happens in the 4–12 weeks following is often what determines whether the reset holds.

Many patients report reduced cravings and heightened emotional openness in the weeks after treatment. In Brown & Alper, 2017, improvements in drug use were largest at one month and were partly sustained through 12 months, which is why the weeks right after treatment matter so much.

The best ibogaine programs build structured aftercare around this window. Integration therapy, peer support and practical changes in the weeks after treatment are what most programmes rely on to keep the progress going.

Is the Ibogaine Flood Dose Right for You?

The flood dose is appropriate for people seeking addiction treatment who are medically cleared and genuinely ready to engage with a demanding, transformative experience. It is not appropriate for recreational use, for people with contraindicated cardiac conditions, or for people unwilling to commit to the post-treatment work that makes it effective.

If you’re considering ibogaine treatment for opioid, stimulant, or alcohol addiction, the first step is a thorough medical and psychological evaluation to determine whether a flood dose protocol is appropriate for your specific situation.

At Psychedelic Connect, we help connect patients with vetted ibogaine treatment centers with experienced clinical teams. We’ll help you understand the protocol, assess your candidacy, and identify the program best suited to your needs.

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Frequently Asked Questions

What is a pre-flood (test) dose?

A pre-flood or test dose is a smaller dose some clinics give before the flood dose, to check how the patient tolerates ibogaine and how the heart responds before going further. Other clinics give a single full dose in a setting equipped for immediate cardiac intervention. Practice varies, so ask any clinic which approach it uses and why.

How much ibogaine is a flood dose?

There is no single standard dose. A flood dose is weight-based and set by the treating physician after medical screening. In the largest prospective study of opioid detox with ibogaine (Brown & Alper, 2017), 30 patients received a mean total of 1,540 mg of ibogaine HCl, with wide variation between people (±920 mg). It is never something to calculate or take yourself.

How long does an ibogaine flood dose last?

The full experience lasts approximately 24–36 hours, with the most intense visionary phase in the first 8–12 hours. A residual stimulation and heightened sensitivity phase continues for the remainder. Most people do not sleep during the experience.

Is a flood dose dangerous?

Yes, it can be. Ibogaine can cause dangerous changes in heart rhythm (QT prolongation), and deaths have been reported, mostly in unsupervised settings. In medically monitored case series, such as Mash et al. (2018, 191 patients) and the Stanford veterans study (2024, 30 patients), no serious adverse events were reported, but those patients were screened and monitored throughout. That is why cardiac screening and continuous monitoring are non-negotiable.

What is the difference between a flood dose and a booster dose?

A flood dose is the primary full treatment. Some programmes give a smaller follow-up (‘booster’) dose days or weeks later to address lingering cravings. Practices vary between clinics and there is little published evidence on boosters, so ask any clinic what it does and why.

Can I receive a flood dose if I’m on Suboxone?

Buprenorphine (Suboxone) binds tightly to opioid receptors and changes how ibogaine treatment has to be managed, so clinics require a planned, supervised transition off it first. How long that takes varies by clinic and by patient. Plan it with your prescriber and the treating clinic, never on your own.