The Toad and the Jaguar is one of the few books on 5-MeO-DMT written by a trained psychologist with decades of first-hand observation. It's short, careful and unusually honest about what can go wrong. It's also the book that gave synthetic 5-MeO-DMT the name "Jaguar." This summary walks through every section, then looks at what holds up and what to read critically.

At a glance

Full title: The Toad and the Jaguar: A Field Report of Underground Research on a Visionary Medicine (Bufo alvarius and 5-methoxy-dimethyltryptamine)
Author: Ralph Metzner, PhD (1936-2019)
Published: 2013, Regent Press for the Green Earth Foundation, Berkeley, California
Length: about 84 pages
Forewords: Charles S. Grob, MD (UCLA psychiatry, Heffter Research Institute) and Stanislav Grof, MD, PhD
Best for: anyone who wants an honest picture of how experienced underground circles worked with 5-MeO-DMT, and the safety lessons they learned the hard way
Reputation note: Metzner is widely respected. The book is not a guide, and it contains dosing material that this summary leaves out.

About the author

Ralph Metzner was part of the Harvard psilocybin research group in the early 1960s alongside Timothy Leary and Richard Alpert, and co-wrote The Psychedelic Experience (1964) with them. He went on to a long career as a psychotherapist and writer on consciousness, ecology and psychedelics. The forewords present him as one of the first to recognize how much set and setting matter for both physical and psychological safety. He died in 2019.

The short version

The book gathers about thirty years of observations from small, private groups in the United States and Europe who worked with 5-MeO-DMT, first as smoked toad secretion and later mostly as the pure synthetic compound. Metzner is clear that this is "field reporting," not controlled science. His central argument has three parts: 5-MeO-DMT can open some of the deepest mystical states people report; the value of the experience depends far more on preparation, setting and guidance than on the molecule itself; and the margin between a meaningful experience and a frightening, dissociated one is narrow, so careful practice matters enormously.

The book traces a clear arc. The early years involved casual smoking and some hard lessons: dissociation, hellish experiences, a possession-like episode, abuse by guides and even a death. Out of those lessons came a slower, more careful ceremonial method the group called "the Jaguar."

Where the name "Jaguar" comes from

From the 1990s onward, Metzner's circles used "Jaguar" as a code name for 5-MeO-DMT in ceremony: "the Jaguar process," "the Jaguar medicine." The name came from ancient Maya images of a shaman's face looking out from a jaguar's open jaws, which matched the medicine's sudden onset. It stuck partly because of a moment Metzner describes in his first experience with the nasal (snuffed) form, when the phrase "Jaguars don't smoke" came to him. He took it as a sign that the gentler snuffed approach suited this medicine better than smoking.

The title follows the book's own journey: from the toad (smoked secretion, 1980s) to the jaguar (measured synthetic medicine in ceremony, 1990s onward). That's why, in some circles today, synthetic 5-MeO-DMT is still called "Jaguar" to set it apart from "Bufo."

Section-by-section summary

The book is one continuous essay with subheadings rather than numbered chapters. Each section is summarized below in order.

Foreword by Charles S. Grob, MD

Grob introduces Metzner as a pioneer who began at Harvard in 1960 and moved from synthetic compounds toward the relationship between people, plants and the natural world. He introduces 5-MeO-DMT as a compound found in Amazonian plant snuffs and, "most curiously," in the secretion of a desert toad. He praises Metzner for looking at the dark side of misuse as well as the benefits, and stresses that safety rests on the setting and on "the expertise and ethical integrity of the facilitator." He notes that basic safety research on 5-MeO-DMT, including its effect on blood pressure and mental stability, was still needed, and that Metzner's observations suggested the nasal route may be considerably safer than smoking or injection.

Foreword by Stanislav Grof, MD

Grof recalls the early promise of psychedelic therapy and calls the crackdown of the late 1960s a misdirected overreaction. During the long research freeze, he says, informal groups kept exploring these substances quietly, and Metzner stayed in contact with them in the US and Europe for three decades. Grof sees particular therapeutic promise in 5-MeO-DMT: powerful enough to be transformative, but short enough to fit into a therapy setting. He suggests a study of PTSD in veterans as a promising first clinical trial, and predicts the book will be seen as a classic.

The Toad and the Jaguar: A Field Report of Underground Research on a Visionary Medicine

Metzner explains why he's writing now. 5-MeO-DMT only became a Schedule I drug in the US in January 2011, so the explorations he reports were legal at the time. He says early researchers including Claudio Naranjo and Alexander Shulgin had deliberately kept the compound out of their publications to avoid drawing prohibitionists' attention, and that he kept the same silence until scheduling made it pointless.

He then sets out the background. 5-MeO-DMT appears with DMT in Virola resin snuffs used by peoples of the western Amazon and Orinoco, and related Anadenanthera snuffs have archaeological roots going back thousands of years. On the toad, he is plain: shamanic use of toad venom is not documented in the ethnographic record. It has only been inferred from toad imagery in Classic Maya art, through a hypothesis by Wade Davis and Andrew Weil. He closes by insisting that the study can't be limited to physical effects, because participants consistently report spiritual dimensions that go beyond words.

Experiences with smoking Bufo alvarius toad venom

This section opens with Wade Davis's own first experience and moves to Metzner's late-1980s trip near Tucson, Arizona with two friends to meet the toad during the rainy season. He describes the animal with real affection: its size, its glands, its "jet-black round eyes," and his own shift from childhood aversion to something like reverence. The group spoke softly to the toads, offered thanks and released them. He insists that collecting secretion must never harm the toad and calls this "obligatory," though he admits his belief that the toad recovers quickly is something they "had been informed" of rather than verified.

He notes that the secretion contains other compounds, such as bufotenine, that may be more toxic, and that pure synthetic material is a different matter. A companion's account follows: peaking in the mountains during a thunderstorm, with his arthritis pain gone for two days afterward. Metzner reports hearing of similar pain relief from others and speculates about muscle relaxation, while making clear this is anecdote.

Effective and dissociative dosage levels

This section is mostly numbers, which aren't reproduced here. Its key idea is that with pure material, the danger isn't physical collapse but psychological dissociation: losing awareness of your own body, voice and surroundings. He distinguishes dissociation from the classic "bad trip." A dissociated person may feel calm or even blissful, yet alarm the people around them with movements and sounds they won't remember. He quotes several dissociative reports from Shulgin's TiHKAL, including one of curling up and screaming inwardly with a large gap in memory. He proposes two rough benchmarks for research: the level at which about half of people feel effects, and the level at which about half dissociate. His point is how close together those two levels are.

Individual factors affecting intensity of experience

The amount taken isn't the only factor. Metzner names body weight, innate sensitivity (some people, often artists, intuitives and highly sensitive people, respond much more strongly) and experience. Experienced people who pay attention to set and setting dissociate far less often than unprepared "trippers." He says the underground scene often failed to appreciate sensitivity, which led to unpleasant experiences that served no one.

Mode of ingestion and duration of effect

He compares DMT and 5-MeO-DMT when inhaled. Both act almost instantly. 5-MeO-DMT lasts somewhat longer, which leaves more room for meditative or therapeutic work. He calls the short duration of both a "pharmacological safety feature": whether the experience is ecstatic or terrifying, nearly everyone returns to ordinary awareness quickly, especially in a familiar, protected setting. He contrasts this with substances where a difficult experience can last hours.

Cosmic consciousness, transcendence and dissociation

The longest experiential section. Metzner explains how hard it is to tell transcendence from dissociation. In the Harvard project's early DMT work, most participants found the experience chaotic, while one visitor trained in meditation simply sat in absorbed silence. His conclusion: meditative experience shapes whether people stay present or simply black out.

He shares Stanislav Grof's account of losing all sense of identity and meeting what Grof called the "Absolute," and then his own first experience, at the Esalen Institute, with an unmeasured amount: total annihilation, rolling on the floor making animal sounds, friends keeping him away from the fireplace. He describes the small groups he worked with in the 1980s, the lesson that voyagers needed a clear ritual space and a sober sitter, and his decision to stop combining 5-MeO-DMT with DMT because DMT only added distracting imagery. Participants' accounts follow: falling "Home" into a radiant center, the threshold between form and formlessness, a vast jeweled lattice. He notes that each person's cosmology shapes what they describe, and summarizes James Oroc's Tryptamine Palace as an example of an atheist's conversion.

Speculative discussion

Metzner offers a clearly labeled hypothesis: the shimmering geometric web people see and feel may be a perception of the molecular level of reality, where there are no solid objects or boundaries. He links it to Indra's jeweled net in Buddhism and draws on Dennis McKenna and Jeremy Narby. Deeper reports of the void or clear light, he suggests, may correspond to even more fundamental levels. He presents all of this as speculation.

Spiritual shamanic healing experiences in group rituals

Here the book describes "the Jaguar process" in detail. Two voyagers at a time lie in the middle of a circle of quiet, meditating "witnessing guardians." Early on, guardians offered hands-on healing, but the group dropped it because guardians were touching people based on their own sense of what was needed. Voyagers were instead left to journey inward and reach for a hand only if they wanted one. Time cues helped people reorient, and sharing happened only after people had sat up, removed blindfolds and made eye contact.

Three accounts follow: a woman who moved through deep pain to feeling held, a man who found courage to leave his job, and a woman with seizures who came to see them differently. Lessons drawn: come with a clear intention rather than to "see what it does"; agree on touch before the session because people are extremely suggestible; and don't place intimate partners side by side, because their experiences tangle together.

Negative reactions and precautionary practices

One of the most valuable sections in the book. Metzner cites pharmacologist David Nichols: these substances aren't organ-toxic, but the real risks are accidents from impaired judgment and triggering psychotic or depressive episodes in people who are predisposed. From hundreds of sessions, he estimates roughly one in ten included some dissociative, panicky or "hellish" moment, usually passing within minutes, and notes the rate would be far higher at parties or raves.

He shares hard cases. A psychiatrist colleague took an unmeasured amount at a gathering, thrashed, lost consciousness while driving the next day, and had about six months of depersonalization and anxiety afterward. A European group of mostly first-timers, many with histories of childhood trauma, got stuck in screaming and moaning that continued after the effects ended; asking people to remove their eyeshades and look at a trusted friend broke the loop. A later group of experienced people had no such turmoil.

His best-practice list: always have a familiar, experienced, sober sitter (he says he would never journey without one); work in pairs; meditate before, not after onset; mark the start and end clearly; and have a physician present or on call. He also describes mantras and prayers people used to steady themselves.

Possession states

Metzner discusses possession as something psychiatry doesn't recognize but folk and shamanic traditions do. He describes two cases. In one, a woman in a group session rolled and flailed and said someone else was moving her; with her consent, the group used an improvised ritual drawn from Brazilian traditions and she calmed. In another, a psychiatrist attended a chaotic "medicine circle" where everyone took the medicine and nobody sat sober, and felt attacked by a malevolent presence for weeks afterward. Metzner reads these as real phenomena; readers can take them as they like. His practical conclusion is sound: chaotic settings with no sober guardian take far longer to resolve problems than calm, structured ones.

Abusive guide behavior

A short, sobering section. Metzner describes two cases he knew personally. In one, a man with a history of sexual misconduct used 5-MeO-DMT by a pool with two women, all three under the influence; his fiancée floated face-down and drowned. In the other, a psychiatrist began using the medicine himself during sessions, groped a patient while intoxicated and lost his license. Metzner's point: the power of this medicine can seduce the people providing it, and it must only be approached "with collaborative caution, experienced guidance and respect."

The snuffing method of ingesting 5-MeO-DMT

This section explains why the later groups moved from smoking to taking pure synthetic 5-MeO-DMT as a nasal snuff, an approach they learned from ethnobotanist Jonathan Ott. It includes measurement and procedural details that aren't reproduced here. Metzner's reasons: amounts are too small to judge by eye, so careful measurement is essential; onset is slower, which leaves time to settle; and the experience lasts longer, which leaves room for meditation and healing work. He says smoking has "no advantages whatsoever" over snuffing, and that a slower, staged approach greatly reduced difficult reactions. He distinguishes a dissociated blackout from an "absorptive" trance in which you stay present in your body and remember everything afterward.

Use of the Jaguar snuff to amplify spiritual healing

The medicine, he argues, doesn't "do" anything on its own. Its value is in amplifying a person's own meditative and healing practice. He describes two working models: a single experienced guide who stays sober, or a small peer group where one person always abstains as "ground control." Groups where everyone took it at will fell into chaos. His planning rule: spend about equal time on preparation, the medicine experience and integration afterward. He outlines a light-focused meditation he used for preparation.

Preparation, integration and hatha yoga practices

The basic ceremony structure: sit together in meditation, take the medicine, lie down with eyes closed or covered, then sit up and share. Music is agreed in advance so the voyager makes no decisions. He notes a striking muscle relaxation and describes gentle seated and lying yoga postures done before and as the medicine begins, then lying still in corpse pose for the journey.

Amplification of pre- and peri-natal experiences

Metzner draws on Grof's birth-related work and William Emerson's prenatal therapy. He reports that earlier 5-MeO-DMT experience made birth and prenatal memories easier to reach in later body and breath work. Accounts include a therapist reliving a difficult birth, and a man finding peace with a pregnancy loss. He cautions that deep birth-trauma work should only be done by guides trained for it, and that combining forceful breathwork or bodywork with 5-MeO-DMT is inappropriate.

Rebirthing and healing experiences in water

A short account of workshops in warm pools where people were held floating. Some took a very mild amount in the water and reported deep peace. Metzner still says he sees no reason to repeat or promote the combination, because "obvious dangers do exist." Given the drowning described earlier, that caution is well placed.

Conclusions

Four closing points: this research area could relieve real suffering if pursued carefully; researchers should be allowed first-hand experience; people exploring outside the law must inform themselves thoroughly about medical and psychological risks; and the spiritual dimensions should be met with humility, because in Metzner's words the substances "do not create but reveal" them.

What holds up, and what to read critically

What holds up well:

Honesty about the toad story. Metzner says plainly that there's no documented traditional use of toad secretion. That's consistent with current research.
Safety lessons. A sober sitter, clear intentions, slow and measured approaches, agreed touch, clear beginnings and endings, a calm setting and medical support all match what careful practice looks like today.
Naming abuse. Few books in this space talk openly about guides who harm people. This one does.
Synthetic over toad. By the end, the method he recommends uses measured, pure synthetic medicine rather than toad secretion.

What to read critically:

Strong safety claims. Phrases like "physiologically completely safe" and "virtually zero" difficult reactions come from careful but unsystematic observation, not controlled research. Grob's more cautious wording in the foreword is closer to the evidence.
No screening. There's almost nothing on medical screening, heart and blood pressure risks, or medication interactions. Those are now central to safe practice.
Toad welfare. The claim that milking doesn't harm toads is hearsay, and the book doesn't discuss population pressure at all. It was written before the toad-ceremony boom.
Speculation. The molecular-perception theory, possession accounts and prenatal "soul memories" are interesting but unproven, and Metzner mostly says so.
Not a guide. Several sections include amounts and methods from underground practice. None of it should be used as instructions.

What it means for choosing a facilitator

Read as a whole, this book is a strong argument for exactly the things worth asking any facilitator about: Will someone sober be with me the whole time? How do we agree on touch? How is the amount measured? What happens if it gets hard? Is there a medical plan? Metzner learned the answers through decades of experience, and some painful mistakes. See How to Choose a Facilitator and Safety & Screening for how those questions apply today.

Where to find it

The Toad and the Jaguar is published by Regent Press and is available through bookshops and second-hand sellers. Erowid keeps a book listing with the details.

Keep reading

Synthetic vs Toad Medicine: why synthetic is the only medicine used here
About 5-MeO-DMT: origins, effects and history
5-MeO-DMT Research: what clinical trials are finding now
All 5-MeO-DMT book summaries

This summary leaves out dosing, preparation and administration details on purpose. It's a summary and review for educational purposes, not a substitute for the book or for medical advice.