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Ibogaine is a naturally occurring
psychoactive A psychoactive drug, psychopharmaceutical, psychoactive agent or psychotropic drug is a chemical substance, that changes functions of the nervous system, and results in alterations in perception, mood, consciousness, cognition or behavior. Th ...
substance found in plants in the family
Apocynaceae Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of the ...
such as ''
Tabernanthe iboga ''Tabernanthe iboga'' (iboga) is an evergreen rainforest shrub native to Central Africa. A member of the Apocynaceae family indigenous to Gabon, the Democratic Republic of Congo, and the Republic of Congo, it is cultivated across Central Africa ...
'', ''
Voacanga africana ''Voacanga africana'' is a small tree native to tropical Africa belonging to the family Apocynaceae that grows to in height and bears leaves that are up to in length. The yellow or white flowers are succeeded by paired, follicular, dehiscent f ...
'', and ''
Tabernaemontana undulata ''Tabernaemontana undulata'', the becchete or bëcchëte (pronounced b'-chéw-teh, a Matis and Matsés word for a medicinal plant) is a plant species in the family Apocynaceae. It occurs in the Amazon rainforest. Effects When applied directly ...
''. It is a
psychedelic Psychedelics are a subclass of hallucinogenic drugs whose primary effect is to trigger non-ordinary states of consciousness (known as psychedelic experiences or "trips").Pollan, Michael (2018). ''How to Change Your Mind: What the New Science of ...
with
dissociative Dissociatives, colloquially dissos, are a subclass of hallucinogens which distort perception of sight and sound and produce feelings of detachment – dissociation – from the environment and/or self. Although many kinds of drugs are capable of ...
properties. Preliminary research indicates that it may help counter
drug addiction Addiction is a neuropsychological disorder characterized by a persistent and intense urge to engage in certain behaviors, one of which is the usage of a drug, despite substantial harm and other negative consequences. Repetitive drug use of ...
. Its use has been associated with serious side effects and death. Between the years 1990 and 2008, a total of 19 fatalities temporally associated with the ingestion of ibogaine were reported, from which six subjects died of acute heart failure or cardiopulmonary arrest. The total number of subjects who have used it without major side effects during this period remains unknown. It is used as an alternative medicine treatment for drug addiction in some countries. Its
prohibition Prohibition is the act or practice of forbidding something by law; more particularly the term refers to the banning of the manufacture, storage (whether in barrels or in bottles), transportation, sale, possession, and consumption of alcoholic ...
in other countries has slowed scientific research. Ibogaine is also used to facilitate psychological introspection and spiritual exploration. Various derivatives of ibogaine designed to lack psychedelic properties (such as
18-MC 18-Methoxycoronaridine (18-MC, or MM-110) is a derivative of ibogaine invented in 1996 by the research team around the pharmacologist Stanley D. Glick from the Albany Medical College and the chemists Upul K. Bandarage and Martin E. Kuehne fro ...
) are under clinical trials which have shown them to be neither psychedelic nor psychoactive and to have acceptable safety profiles in humans. The psychoactivity of the root bark of the iboga tree (''Tabernanthe iboga''), from which ibogaine is extracted, was first discovered by the
Pygmy In anthropology, pygmy peoples are ethnic groups whose average height is unusually short. The term pygmyism is used to describe the phenotype of endemic short stature (as opposed to disproportionate dwarfism occurring in isolated cases in a pop ...
tribes of Central Africa, who passed the knowledge to the
Bwiti Bwiti is a spiritual discipline of the forest-dwelling Punu people and Mitsogo peoples of Gabon (where it is recognized as one of three official religions) and by the Fang people of Gabon and Cameroon. Modern Bwiti incorporates animism, ancestor w ...
tribe of
Gabon Gabon (; ; snq, Ngabu), officially the Gabonese Republic (french: République gabonaise), is a country on the west coast of Central Africa. Located on the equator, it is bordered by Equatorial Guinea to the northwest, Cameroon to the north ...
. French explorers in turn learned of it from the Bwiti tribe and brought ibogaine back to Europe in 1899–1900, where it was subsequently marketed in France as a stimulant under the trade name ''Lambarène''. Ibogaine-containing preparations are used for medicinal and ritual purposes within the African spiritual traditions of the Bwiti, who claim to have learned it from the
Pygmy peoples In anthropology, pygmy peoples are ethnic groups whose average height is unusually short. The term pygmyism is used to describe the phenotype of endemic short stature (as opposed to disproportionate dwarfism occurring in isolated cases in a po ...
. Although ibogaine's
anti-addictive Addiction is a neuropsychological disorder characterized by a persistent and intense urge to engage in certain behaviors, one of which is the usage of a drug, despite substantial harm and other negative consequences. Repetitive drug use of ...
properties were first widely promoted in 1962 by
Howard Lotsof Howard Lotsof (March 1, 1943 – January 31, 2010) was an American scientific researcher who discovered and pioneered the use of ibogaine as an approach in Western medicine in the treatment of substance addictions. In 1962, at the age of 19, Lotsof ...
, its Western medical use predates that by at least a century. Additionally, the U.S.
Central Intelligence Agency The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian foreign intelligence service of the federal government of the United States, officially tasked with gathering, processing, ...
(CIA) studied the effects of ibogaine in the 1950s. Ibogaine is an
indole alkaloid Indole alkaloids are a class of alkaloids containing a structural moiety of indole; many indole alkaloids also include isoprene groups and are thus called terpene indole or secologanin tryptamine alkaloids. Containing more than 4100 known differe ...
that is obtained either by extraction from the iboga plant or by semi-synthesis from the precursor compound
voacangine Voacangine (12-methoxyibogamine-18-carboxylic acid methyl ester) is an alkaloid found predominantly in the root bark of the ''Voacanga africana'' tree, as well as in other plants such as ''Tabernanthe iboga'', ''Tabernaemontana africana'', ''Trach ...
, another plant alkaloid. The
total synthesis Total synthesis is the complete chemical synthesis of a complex molecule, often a natural product, from simple, commercially-available precursors. It usually refers to a process not involving the aid of biological processes, which distinguishes ...
of ibogaine was described in 1956. Structural elucidation by
X-ray crystallography X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles ...
was completed in 1960.


Psychoactive effects

Ibogaine is derived from the root of the ''
Tabernanthe iboga ''Tabernanthe iboga'' (iboga) is an evergreen rainforest shrub native to Central Africa. A member of the Apocynaceae family indigenous to Gabon, the Democratic Republic of Congo, and the Republic of Congo, it is cultivated across Central Africa ...
'', a plant known to exhibit
psychedelic Psychedelics are a subclass of hallucinogenic drugs whose primary effect is to trigger non-ordinary states of consciousness (known as psychedelic experiences or "trips").Pollan, Michael (2018). ''How to Change Your Mind: What the New Science of ...
effects in its users. The experience of ibogaine occurs in two phases, termed the visionary phase and the introspection phase. The visionary phase has been described as
oneirogen An oneirogen, from the Greek ὄνειρος ''óneiros'' meaning "dream" and ''gen'' "to create", is that which produces or enhances dreamlike states of consciousness. This is characterized by an immersive dream state similar to REM sleep, which ...
ic, referring to the dreamlike nature of its
psychedelic Psychedelics are a subclass of hallucinogenic drugs whose primary effect is to trigger non-ordinary states of consciousness (known as psychedelic experiences or "trips").Pollan, Michael (2018). ''How to Change Your Mind: What the New Science of ...
effects, and lasts for 4 to 6 hours. The second phase, the introspection phase, is responsible for the psychotherapeutic effects. It can allow people to conquer their fears and negative emotions. Ibogaine catalyzes an
altered state of consciousness An altered state of consciousness (ASC), also called altered state of mind or mind alteration, is any condition which is significantly different from a normal waking state. By 1892, the expression was in use in relation to hypnosis, though there ...
reminiscent of dreaming while fully conscious and aware so that memories, life experiences, and issues of trauma can be processed.


Uses


Medical

Ibogaine is not currently approved for any medical uses. There are legal ibogaine rehabilitation facilities in Mexico and Brazil. Clinical studies of ibogaine to treat drug addiction began in the early 1990s, but concerns about
cardiotoxicity Cardiotoxicity is the occurrence of heart dysfunction as electric or muscle damage, resulting in heart toxicity. The heart becomes weaker and is not as efficient in pumping blood. Cardiotoxicity may be caused by chemotherapy (a usual example is th ...
led to termination of those studies. There is insufficient data to determine whether it is useful in treating addiction.


Religious

In Bwiti religious ceremonies, the root bark is pulverized and swallowed in large amounts to produce intense psychoactive effects.


Adverse effects


Immediate

One of the first noticeable effects of large-dose ibogaine ingestion is
ataxia Ataxia is a neurological sign consisting of lack of voluntary coordination of muscle movements that can include gait abnormality, speech changes, and abnormalities in eye movements. Ataxia is a clinical manifestation indicating dysfunction of ...
, a difficulty in coordinating muscle motion which makes standing and walking difficult without assistance.
Xerostomia Xerostomia, also known as dry mouth, is dryness in the mouth, which may be associated with a change in the composition of saliva, or reduced salivary flow, or have no identifiable cause. This symptom is very common and is often seen as a side ef ...
(dry mouth),
nausea Nausea is a diffuse sensation of unease and discomfort, sometimes perceived as an urge to vomit. While not painful, it can be a debilitating symptom if prolonged and has been described as placing discomfort on the chest, abdomen, or back of the ...
, and vomiting may follow. These symptoms may be long in duration, ranging from 4 to 24 hours in some cases. Ibogaine is sometimes administered '' per rectum'' to avoid nausea and vomiting. Ibogaine decreases body temperature.


Cardiovascular

Ibogaine causes
long QT syndrome Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. It results in an increased risk of an irregular heartbeat which can result in fainting, d ...
at higher doses, apparently by blocking
hERG hERG (the human '' Ether-à-go-go''-Related Gene) is a gene () that codes for a protein known as Kv11.1, the alpha subunit of a potassium ion channel. This ion channel (sometimes simply denoted as 'hERG') is best known for its contribution to th ...
potassium channels in the heart.


Neurotoxicity

Work in the laboratory of Mark Molliver at
Johns Hopkins Johns Hopkins (May 19, 1795 – December 24, 1873) was an American merchant, investor, and philanthropist. Born on a plantation, he left his home to start a career at the age of 17, and settled in Baltimore, Maryland where he remained for most ...
indicated degeneration of cerebellar
Purkinje cells Purkinje cells, or Purkinje neurons, are a class of GABAergic inhibitory neurons located in the cerebellum. They are named after their discoverer, Czech anatomist Jan Evangelista Purkyně, who characterized the cells in 1839. Structure The ...
observed in rats given substantially larger dosages of ibogaine than those used to study drug self-administration and withdrawal. However, subsequent research found no evidence of neurotoxicity in a primate or mouse at dosages that produced cerebellar degeneration in the rat, and it has been suggested that cerebellar degeneration might be a phenomenon limited to a single species. The FDA was aware of Molliver's work at the time it approved a phase-1 study in which humans received ibogaine in 1993. Neuropathological examination revealed no evidence of degenerative changes in a woman who had received four separate doses of ibogaine ranging between 10 and 30 mg⁄ kg over a 15-month interval. A published series of fatalities temporally associated with the ingestion of ibogaine found no evidence suggesting a characteristic syndrome of neurotoxicity.


Interactions

Adverse interactions may occur between ibogaine and psychiatric medications. Some studies also suggest the possibility of adverse interaction with heart conditions. Because ibogaine is one of the many drugs that are partly metabolized by the
cytochrome P450 Cytochromes P450 (CYPs) are a Protein superfamily, superfamily of enzymes containing heme as a cofactor (biochemistry), cofactor that functions as monooxygenases. In mammals, these proteins oxidize steroids, fatty acids, and xenobiotics, and are ...
complex, caution must be exercised to avoid foods or drugs that interfere with these CYP450 enzymes, in particular foods containing
bergamottin Bergamottin (5-geranoxypsoralen) is a natural furanocoumarin found in the pulp of pomelos and grapefruits. It is also found in the peel and pulp of the bergamot orange, from which it was first isolated and from which its name is derived. Chemis ...
or bergamot oil, such as grapefruit juice. Ibogaine is an antagonist to
reserpine Reserpine is a drug that is used for the treatment of high blood pressure, usually in combination with a thiazide diuretic or vasodilator. Large clinical trials have shown that combined treatment with reserpine plus a thiazide diuretic reduces m ...
.


Pharmacology


Pharmacodynamics

Ibogaine affects many different
neurotransmitter A neurotransmitter is a signaling molecule secreted by a neuron to affect another cell across a synapse. The cell receiving the signal, any main body part or target cell, may be another neuron, but could also be a gland or muscle cell. Neuro ...
systems simultaneously. Noribogaine is most potent as a
serotonin reuptake inhibitor A serotonin reuptake inhibitor (SRI) is a type of drug which acts as a reuptake inhibitor of the neurotransmitter serotonin (5-hydroxytryptamine, or 5-HT) by blocking the action of the serotonin transporter (SERT). This in turn leads to increase ...
. It acts as a moderate
κ-opioid receptor The κ-opioid receptor or kappa opioid receptor, abbreviated KOR or KOP, is a G protein-coupled receptor that in humans is encoded by the ''OPRK1'' gene. The KOR is coupled to the G protein Gi/G0 and is one of four related receptors that bind op ...
agonist and weak
μ-opioid receptor The μ-opioid receptors (MOR) are a class of opioid receptors with a high affinity for enkephalins and beta-endorphin, but a low affinity for dynorphins. They are also referred to as μ(''mu'')-opioid peptide (MOP) receptors. The prototypical ...
agonist or weak partial agonist. It is possible that the action of ibogaine at the kappa opioid receptor may indeed contribute significantly to the psychoactive effects attributed to ibogaine ingestion;
Salvia divinorum ''Salvia divinorum'' (Latin: "sage of the diviners"; also called ska maría pastora, seer's sage, yerba de la pastora, magic mint or simply salvia) is a plant species with transient psychoactive properties when its leaves are consumed by che ...
, another plant recognized for its strong hallucinogenic properties, contains the chemical
salvinorin A Salvinorin A is the main active psychotropic molecule in '' Salvia divinorum''. Salvinorin A is considered a dissociative hallucinogen. It is structurally distinct from other naturally occurring hallucinogens (such as DMT, psilocybin, and ...
, which is a highly selective kappa opioid agonist. Noribogaine is more potent than ibogaine in rat drug discrimination assays when tested for the subjective effects of ibogaine.


Pharmacokinetics

Ibogaine is metabolized in the human body by cytochrome P450 2D6 (
CYP2D6 Cytochrome P450 2D6 (CYP2D6) is an enzyme that in humans is encoded by the ''CYP2D6'' gene. ''CYP2D6'' is primarily expressed in the liver. It is also highly expressed in areas of the central nervous system, including the substantia nigra. CYP2D ...
) into
noribogaine Noribogaine (actually O-desmethylibogaine), or 12-hydroxyibogamine, is the principal psychoactive metabolite of the oneirogen ibogaine. It is thought to be involved in the antiaddictive effects of ibogaine-containing plant extracts, such as '' ...
(more correctly, O-desmethylibogaine or 12-hydroxyibogamine). Both ibogaine and noribogaine have a
plasma half-life Biological half-life (also known as elimination half-life, pharmacologic half-life) is the time taken for concentration of a biological substance (such as a medication) to decrease from its maximum concentration ( Cmax) to half of Cmax in the bl ...
of around two hours in the rat, although the half-life of noribogaine is slightly longer than that of the parent compound. It is proposed that ibogaine is deposited in fat and metabolized into noribogaine as it is released. After ibogaine ingestion in humans, noribogaine shows higher plasma levels than ibogaine and is detected for a longer period of time than ibogaine.


Chemistry

Ibogaine is a
tryptamine Tryptamine is an indolamine metabolite of the essential amino acid, tryptophan. The chemical structure is defined by an indole ─ a fused benzene and pyrrole ring, and a 2-aminoethyl group at the second carbon (third aromatic atom, with the f ...
. It has two separate
chiral Chirality is a property of asymmetry important in several branches of science. The word ''chirality'' is derived from the Greek (''kheir''), "hand", a familiar chiral object. An object or a system is ''chiral'' if it is distinguishable from ...
centers, meaning that there are four different stereoisomers of ibogaine. These four isomers are difficult to
resolve Resolve may refer to: * ''Resolve'' (Lagwagon album) * ''Resolve'' (Last Tuesday album) * "Resolve" (song), by the Foo Fighters *'' The Resolve'', a 1915 American silent short drama film * "Resolve" (''One Tree Hill'' episode) *''Resolve'', a Brit ...
.


Synthesis

One recent total synthesis of ibogaine and related drugs starts with 2-iodo-4-methoxyaniline which is reacted with triethyl((4-(triethylsilyl)but-3-yn-1-yl)oxy)silane using
palladium acetate Palladium(II) acetate is a chemical compound of palladium described by the formula d(O2CCH3)2sub>n, abbreviated d(OAc)2sub>n. It is more reactive than the analogous platinum compound. Depending on the value of n, the compound is soluble in man ...
in DMF to form 2-(triethylsilyl)-3-(2-((triethylsilyl)oxy)ethyl)-1H-indole. This is converted using N-iodosuccinamide and then
fluoride Fluoride (). According to this source, is a possible pronunciation in British English. is an inorganic, monatomic anion of fluorine, with the chemical formula (also written ), whose salts are typically white or colorless. Fluoride salts typ ...
to form 2-(2-iodo-1H-indol-3-yl)ethanol. This is treated with
iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...
,
triphenyl phosphine Triphenylphosphine (IUPAC name: triphenylphosphane) is a common organophosphorus compound with the formula P(C6H5)3 and often abbreviated to P Ph3 or Ph3P. It is widely used in the synthesis of organic and organometallic compounds. PPh3 exists ...
, and
imidazole Imidazole (ImH) is an organic compound with the formula C3N2H4. It is a white or colourless solid that is soluble in water, producing a mildly alkaline solution. In chemistry, it is an aromatic heterocycle, classified as a diazole Diazole refers ...
to form 2-iodo-3-(2-iodoethyl)-1H-indole. Then, using 7-ethyl-2-azabicyclo .2.2ct-5-ene and
cesium Caesium (IUPAC spelling) (or cesium in American English) is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of , which makes it one of only five elemental metals that ar ...
carbonate A carbonate is a salt of carbonic acid (H2CO3), characterized by the presence of the carbonate ion, a polyatomic ion with the formula . The word ''carbonate'' may also refer to a carbonate ester, an organic compound containing the carbonate g ...
in
acetonitrile Acetonitrile, often abbreviated MeCN (methyl cyanide), is the chemical compound with the formula and structure . This colourless liquid is the simplest organic nitrile (hydrogen cyanide is a simpler nitrile, but the cyanide anion is not clas ...
, the ibogaine precursor 7-ethyl-2-(2-(2-iodo-1H-indol-3-yl)ethyl)-2-azabicyclo .2.2ct-5-ene is obtained. Using palladium acetate in DMF, the ibogaine is obtained. If the exo ethyl group on the 2-azabicyclo .2.2ctane system in ibogaine is replaced with an endo ethyl, then epiibogaine is formed. Crystalline ibogaine hydrochloride is typically produced by semi-synthesis from
voacangine Voacangine (12-methoxyibogamine-18-carboxylic acid methyl ester) is an alkaloid found predominantly in the root bark of the ''Voacanga africana'' tree, as well as in other plants such as ''Tabernanthe iboga'', ''Tabernaemontana africana'', ''Trach ...
in commercial laboratories. It can be prepared from voacangine through one-step demethoxycarbonylation process too.


Derivatives

A synthetic derivative of ibogaine,
18-methoxycoronaridine 18-Methoxycoronaridine (18-MC, or MM-110) is a derivative of ibogaine invented in 1996 by the research team around the pharmacologist Stanley D. Glick from the Albany Medical College and the chemists Upul K. Bandarage and Martin E. Kuehne fro ...
(18-MC), is a selective α3β4 antagonist that was developed collaboratively by the neurologist Stanley D. Glick (Albany) and the chemist Martin E. Kuehne (Vermont). This discovery was stimulated by earlier studies on other naturally occurring analogues of ibogaine such as
coronaridine Coronaridine, also known as 18-carbomethoxyibogamine, is an alkaloid found in ''Tabernanthe iboga'' and related species, including ''Tabernaemontana divaricata'' for which (under the now obsolete synonym ''Ervatamia coronaria'') it was named. Li ...
and
voacangine Voacangine (12-methoxyibogamine-18-carboxylic acid methyl ester) is an alkaloid found predominantly in the root bark of the ''Voacanga africana'' tree, as well as in other plants such as ''Tabernanthe iboga'', ''Tabernaemontana africana'', ''Trach ...
that showed these compounds also have anti-addictive properties. More recently, non- and less- hallucinogenic analogs, tabernanthalog and ibogainalog, were engineered by scientists attempting to produce non-cardiotoxic ibogaine derivatives by removing the lipophilic isoquinuclidine ring. In animal models, both molecules failed to produce cardiac arrhythmias and tabernanthalog failed to produce any head twitch response, suggesting psychedelic effects were absent.


Natural occurrence

Ibogaine occurs naturally in iboga root bark. Ibogaine is also available in a total alkaloid extract of the ''Tabernanthe iboga'' plant, which also contains all the other iboga alkaloids and thus has only about half the potency by weight of standardized ibogaine hydrochloride.


History

The use of iboga in African spiritual ceremonies was first reported by French and Belgian explorers in the 19th century, beginning with the work of French naval physician and
explorer Exploration refers to the historical practice of discovering remote lands. It is studied by geographers and historians. Two major eras of exploration occurred in human history: one of convergence, and one of divergence. The first, covering most ...
of
Gabon Gabon (; ; snq, Ngabu), officially the Gabonese Republic (french: République gabonaise), is a country on the west coast of Central Africa. Located on the equator, it is bordered by Equatorial Guinea to the northwest, Cameroon to the north ...
Marie-Théophile Griffon du Bellay Marie-Théophile Griffon du Bellay (14 August 1829 – 10 November 1908) was a French physician, naval surgeon, explorer and ethnobotanist. Life Marie-Théophile was born at Rochefort, the middle child of the three sons of Joseph Jean B ...
. The first botanical description of the ''Tabernanthe iboga'' plant was made in 1889. Ibogaine was first isolated from ''T.
iboga ''Tabernanthe iboga'' (iboga) is an evergreen rainforest shrub native to Central Africa. A member of the Apocynaceae family indigenous to Gabon, the Democratic Republic of Congo, and the Republic of Congo, it is cultivated across Central Africa ...
'' in 1901 by Dybowski and Landrin and independently by Haller and Heckel in the same year using ''T. iboga'' samples from
Gabon Gabon (; ; snq, Ngabu), officially the Gabonese Republic (french: République gabonaise), is a country on the west coast of Central Africa. Located on the equator, it is bordered by Equatorial Guinea to the northwest, Cameroon to the north ...
. Complete synthesis of ibogaine was accomplished by G. Büchi in 1966. Since then, several other synthesis methods have been developed. From the 1930s to 1960s, ibogaine was sold in France in the form of Lambarène, an extract of the ''Tabernanthe manii'' plant, and promoted as a mental and physical stimulant. The drug enjoyed some popularity among post-World War II athletes. Lambarène was withdrawn from the market in 1966 when the sale of ibogaine-containing products became illegal in France. In the late 1960s, the
World Health Assembly The World Health Assembly (WHA) is the forum through which the World Health Organization (WHO) is governed by its 194 member states. It is the world's highest health policy setting body and is composed of health ministers from member states. T ...
classified ibogaine as a "substance likely to cause dependency or endanger human health"; the U.S. Food and Drug Administration (FDA) assigned it Schedule I classification, and the
International Olympic Committee The International Olympic Committee (IOC; french: link=no, Comité international olympique, ''CIO'') is a non-governmental sports organisation based in Lausanne, Switzerland. It is constituted in the form of an association under the Swiss ...
banned it as a potential doping agent. Anecdotal reports concerning ibogaine's effects appeared in the early 1960s. Its anti-addictive properties were discovered accidentally by
Howard Lotsof Howard Lotsof (March 1, 1943 – January 31, 2010) was an American scientific researcher who discovered and pioneered the use of ibogaine as an approach in Western medicine in the treatment of substance addictions. In 1962, at the age of 19, Lotsof ...
in 1962, at the age of 19, when he and five friends—all heroin addicts—noted subjective reduction of their craving and
withdrawal Withdrawal means "an act of taking out" and may refer to: * Anchoresis (withdrawal from the world for religious or ethical reasons) * ''Coitus interruptus'' (the withdrawal method) * Drug withdrawal * Social withdrawal * Taking of money from a ban ...
symptoms while taking it. Further anecdotal observation convinced Lotsof of its potential usefulness in treating substance addictions. He contracted with a Belgian company to produce ibogaine in tablet form for clinical trials in the Netherlands, and was awarded a United States patent for the product in 1985. The first objective, placebo-controlled evidence of ibogaine's ability to attenuate opioid withdrawal in rats was published by Dzoljic ''et al.'' in 1988. Diminution of
morphine Morphine is a strong opiate that is found naturally in opium, a dark brown resin in poppies (''Papaver somniferum''). It is mainly used as a analgesic, pain medication, and is also commonly used recreational drug, recreationally, or to make ...
self-administration was reported in preclinical studies by Glick ''et al.'' in 1991. Cappendijk ''et al.'' demonstrated reduction in
cocaine Cocaine (from , from , ultimately from Quechuan languages, Quechua: ''kúka'') is a central nervous system (CNS) stimulant mainly recreational drug use, used recreationally for its euphoria, euphoric effects. It is primarily obtained from t ...
self-administration in rats in 1993, and Rezvani reported reduced
alcohol dependence Alcohol dependence is a previous (DSM-IV and ICD-10) psychiatric diagnosis in which an individual is physically or psychologically dependent upon alcohol (also chemically known as ethanol). In 2013, it was reclassified as alcohol use disorde ...
in three strains of "alcohol-preferring" rats in 1995. As the use of ibogaine spread, its administration varied widely; some groups administered it systematically using well-developed methods and medical personnel, while others employed haphazard and possibly dangerous methodology. Lotsof and his colleagues, committed to the traditional administration of ibogaine, developed treatment regimens themselves. In 1992, Eric Taub brought ibogaine to an offshore location close to the United States, where he began providing treatments and popularizing its use. In
Costa Rica Costa Rica (, ; ; literally "Rich Coast"), officially the Republic of Costa Rica ( es, República de Costa Rica), is a country in the Central American region of North America, bordered by Nicaragua to the north, the Caribbean Sea to the no ...
, Lex Kogan, another leading proponent, joined Taub in systematizing its administration. The two men established medically monitored treatment clinics in several countries. In 1981, an unnamed European manufacturer produced 44 kg of iboga extract. The entire stock was purchased by Carl Waltenburg, who distributed it under the name "Indra extract" and used it in 1982 to treat heroin addicts in the community of Christiania. Indra extract was available for sale over the Internet until 2006, when the Indra web presence disappeared. Various products are currently sold in a number of countries as "Indra extract", but it is unclear if any of them are derived from Waltenburg's original stock. Ibogaine and related
indole Indole is an aromatic heterocyclic organic compound with the formula C8 H7 N. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered pyrrole ring. Indole is widely distributed in the natural environmen ...
compounds are susceptible to
oxidation Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a d ...
over time. The
National Institute on Drug Abuse The National Institute on Drug Abuse (NIDA) is a United States federal government research institute whose mission is to "advance science on the causes and consequences of drug use and addiction and to apply that knowledge to improve individual a ...
(NIDA) began funding clinical studies of ibogaine in the United States in the early 1990s, but terminated the project in 1995. Data demonstrating ibogaine's efficacy in attenuating opioid withdrawal in drug-dependent human subjects was published by Alper ''et al.'' in 1999. A cohort of 33 patients were treated with 6 to 29 mg/kg of ibogaine; 25 displayed resolution of the signs of opioid withdrawal from 24 hours to 72 hours post-treatment, but one 24-year-old female, who received the highest dosage, died. Mash ''et al.'' (2000), using lower oral doses (10–12 mg/kg) in 27 patients, demonstrated significantly lower objective opiate withdrawal scores in heroin addicts 36 hours after treatment, with self-reports of decreased cocaine and opiate craving and alleviated depression symptoms. Many of these effects appeared sustainable over a one-month post-discharge follow-up.


Society and culture


Legal status

The Global Ibogaine Therapy Alliance publishes a map of ibogaine legal status in various countries around the world.


Treatment clinics

Ibogaine treatment clinics have emerged in
Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
,
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
, the
Netherlands ) , anthem = ( en, "William of Nassau") , image_map = , map_caption = , subdivision_type = Sovereign state , subdivision_name = Kingdom of the Netherlands , established_title = Before independence , established_date = Spanish Netherl ...
,
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
, and
New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
, all operating in what has been described as a "legal gray area".Hegarty, S. (13 April 2012). Can a hallucinogen from Africa cure addiction
BBC News archive
Retrieved 17 June 2015.
Ibogaine therapy for drug addiction
maps.org archive
Retrieved 17 June 2015.
Costa Rica Costa Rica (, ; ; literally "Rich Coast"), officially the Republic of Costa Rica ( es, República de Costa Rica), is a country in the Central American region of North America, bordered by Nicaragua to the north, the Caribbean Sea to the no ...
also has treatment centers. Covert, illegal neighborhood clinics are known to exist in the United States, despite active
DEA The Drug Enforcement Administration (DEA; ) is a United States federal law enforcement agency under the U.S. Department of Justice tasked with combating drug trafficking and distribution within the U.S. It is the lead agency for domestic enf ...
surveillance. While clinical guidelines for ibogaine-assisted detoxification were released by the Global Ibogaine Therapy Alliance in 2015, addiction specialists warn that the treatment of drug dependence with ibogaine in non-medical settings, without expert supervision and unaccompanied by appropriate psychosocial care, can be dangerous — and, in approximately one case in 300, potentially fatal.


Media


Documentary films

''Detox or Die'' (2004) :Directed by David Graham Scott. David Graham Scott begins videotaping his heroin-addicted friends. Before long, he himself is addicted to the drug. He eventually turns the camera on himself and his family. After 12 years of debilitating, painful dependence on methadone, Scott turns to ibogaine. Filmed in Scotland and England, and broadcast on
BBC One BBC One is a British free-to-air public broadcast television network owned and operated by the BBC. It is the corporation's flagship network and is known for broadcasting mainstream programming, which includes BBC News television bulletins, p ...
as the third installment in the documentary series ''One Life''. ''Ibogaine: Rite of Passage'' (2004) :Directed by Ben Deloenen. Cy, a 34-year-old heroin addict, undergoes ibogaine treatment with Dr. Martin Polanco at the Ibogaine Association, a clinic in Rosarito, Mexico. Deloenen interviews people formerly addicted to heroin, cocaine, and methamphetamine, who share their perspectives about ibogaine treatment. In Gabon, a
Babongo The Bongo people, also called Babongo or Bazimba, are an agricultural people of Gabon in equatorial Africa who are known as "forest people" due to their recent foraging economy. They are not to be confused with the autocrat leadership of Omar Bon ...
woman receives iboga root for her depressive malaise. Deloenen visually contrasts this Western, clinical use of ibogaine with the Bwiti use of iboga root, but emphasizes the Western context. ''Facing the Habit'' (2007) :Directed by Magnolia Martin. Martin's subject is a former millionaire and stockbroker who travels to Mexico for ibogaine treatment for heroin addiction. ''Tripping in Amsterdam'' (2008) :In this short film directed by Jan Bednarz, Simon "Swany" Wan visits Sara Glatt's iboga treatment center in Amsterdam.
Current TV Current TV was an American television channel which broadcast from August 1, 2005, to August 20, 2013. Prior INdTV founders Al Gore and Joel Hyatt, with Ronald Burkle, each held a sizable stake in Current TV. Comcast and DirecTV each held a smalle ...
broadcast the documentary in 2008 as part of their "Quarter-life Crisis" programming roster. ''I'm Dangerous with Love'' (2009) :Directed by Michel Negroponte. Negroponte examines
Dimitri Mobengo Mugianis Dimitri Mugianis (born August 4, 1962) is a harm reductionist, activist, musician, poet, writer, anarchist, and psychedelic practitioner. Early life Dimitri was born in Detroit, Michigan to a politically leftist Greek American family. While still a ...
's long, clandestine career of treating heroin addicts with ibogaine. "Hallucinogens" (2012) :In one of five segments from this episode of ''
Drugs, Inc. ''Drugs, Inc.'' is an American documentary style television series on the National Geographic Channel that explores global narcotics production and trafficking. The series features drug dealers, recreational users, and addicts, as well as profes ...
'' on
National Geographic Channel National Geographic (formerly National Geographic Channel; abbreviated and trademarked as Nat Geo or Nat Geo TV) is an American pay television television network, network and flagship (broadcasting), flagship channel owned by the National Geograp ...
, a former heroin user treats addicts with ibogaine in Canada. He himself used ibogaine to stop his abuse of narcotics. "Addiction" (2013) :This episode of the
HBO Home Box Office (HBO) is an American premium television network, which is the flagship property of namesake parent subsidiary Home Box Office, Inc., itself a unit owned by Warner Bros. Discovery. The overall Home Box Office business unit is ba ...
documentary series ''
Vice A vice is a practice, behaviour, or habit generally considered immoral, sinful, criminal, rude, taboo, depraved, degrading, deviant or perverted in the associated society. In more minor usage, vice can refer to a fault, a negative character tra ...
'' devotes a segment to the use of ibogaine to interrupt heroin addiction. ''The Ibogaine Safari'' (2014) :A documentary by filmmaker Pierre le Roux which investigates the claims of painless withdrawal from opiates such as
nyaope Whoonga (also known as nyaope or wonga) is a form of black tar heroin, sometimes mixed with other substances, that came into widespread use in South Africa in 2009. Its use is concentrated in the impoverished Township (South Africa), townships ...
/heroin in South Africa by taking several addicts on an adventure "safari" while taking ibogaine. The documentary won the award for 'Best Documentary Short' at the 2014
Canada International Film Festival The Edgewater Casino is a former casino that was located at 760 Pacific Blvd South Vancouver, British Columbia. It was in operation from 2005 to 2017. History The Edgwater Casino opened in February 2005. In 2006, the casino was acquired by Para ...
. ''Iboga Nights'' (2014) : Directed by David Graham Scott. ''Dosed'' (2019) :A documentary by Tyler Chandler and Nicholas Meyers. Synopsis- After many years of prescription medications failed her a suicidal woman turns to underground healers to try and overcome her depression, anxiety, and opioid addiction with illegal psychedelic medicine like magic mushrooms and iboga. Adrianne’s first dose of psilocybin mushrooms catapulted her into an unexpected world of healing where plant medicines are redefining our understanding of mental health and addiction. "Synthetic Ibogaine - Natural Tramadol" (2021) :This episode of the documentary series ''
Hamilton's Pharmacopeia ''Hamilton's Pharmacopeia'' is an American docuseries, which premiered on Viceland on October 26, 2016. The show follows Hamilton Morris as he explores the history, chemistry and social impact of psychoactive substances. It chronicles Morris' ...
'' on
Vice on TV Vice (formerly known as Viceland and also known as Vice TV) is an American basic cable television channel that launched on December 2, 2019, replacing H2 on most multichannel television providers in the United States. It is a part of the Vicela ...
, follows a struggling local addict to a Ibogaine ritual. "Lamar Odom Reborn" (2022) :A documentary by
Mike "Zappy" Zapolin Mike "Zappy" Zapolin is an American entrepreneur who is considered a pioneer in the domain name industry. He has created Internet brands that have included Music.com, Beer.com, Computer.com, Creditcards.com, Diamond.com and PrescriptionDrugs.com. ...
that features the NBA player and Meeting the Kardashians star
Lamar Odom Lamar Joseph Odom (born November 6, 1979) is an American former professional basketball player. As a member of the Los Angeles Lakers in the National Basketball Association (NBA), he won championships in 2009 and 2010 and was named the NBA Sixt ...
as he seeks out ibogaine and other therapies to heal PTSD, anxiety, and addiction.


Print media

While in Wisconsin covering the primary campaign for the United States presidential election of 1972, gonzo journalist
Hunter S. Thompson Hunter Stockton Thompson (July 18, 1937 – February 20, 2005) was an American journalist and author who founded the gonzo journalism movement. He rose to prominence with the publication of '' Hell's Angels'' (1967), a book for which he s ...
submitted a satirical article to ''
Rolling Stone ''Rolling Stone'' is an American monthly magazine that focuses on music, politics, and popular culture. It was founded in San Francisco, San Francisco, California, in 1967 by Jann Wenner, and the music critic Ralph J. Gleason. It was first kno ...
'' accusing
Democratic Party Democratic Party most often refers to: *Democratic Party (United States) Democratic Party and similar terms may also refer to: Active parties Africa *Botswana Democratic Party *Democratic Party of Equatorial Guinea *Gabonese Democratic Party *Demo ...
candidate
Edmund Muskie Edmund Sixtus Muskie (March 28, 1914March 26, 1996) was an American statesman and political leader who served as the 58th United States Secretary of State under President Jimmy Carter, a United States Senator from Maine from 1959 to 1980, the 6 ...
of being addicted to ibogaine. Many readers, and even other journalists, did not realize that the ''Rolling Stone'' piece was facetious. The ibogaine assertion, which was completely unfounded, did significant damage to Muskie's reputation, and was cited as a factor in his loss of the nomination to
George McGovern George Stanley McGovern (July 19, 1922 – October 21, 2012) was an American historian and South Dakota politician who was a U.S. representative and three-term U.S. senator, and the Democratic Party presidential nominee in the 1972 pres ...
. Thompson later said he was surprised that anyone believed it. The article is included in Thompson's post-election anthology, ''
Fear and Loathing on the Campaign Trail '72 ''Fear and Loathing: On the Campaign Trail '72'' is a 1973 book that recounts and analyzes the 1972 presidential campaign in which Richard Nixon was re-elected President of the United States. Written by Hunter S. Thompson and illustrated by Ra ...
'' (1973). Author and
Yippie The Youth International Party (YIP), whose members were commonly called Yippies, was an American youth-oriented radical and countercultural revolutionary offshoot of the free speech and anti-war movements of the late 1960s. It was founded on D ...
Dana Beal Irvin Dana Beal (born January 9, 1947 in Ravenna, Ohio) is an American social and political activist, best known for his efforts to legalize marijuana and to promote the benefits of Ibogaine as an addiction treatment. He is a founder and long-ter ...
co-wrote the 1997 book ''The Ibogaine Story''. American author
Daniel Pinchbeck Daniel Pinchbeck is an American author. His books include '' Breaking Open the Head: A Psychedelic Journey into the Heart of Contemporary Shamanism'', ''2012: The Return of Quetzalcoatl'' , and ''Notes from the Edge Times''. He is a co-founder ...
wrote about his own experience of ibogaine in his book ''
Breaking Open the Head ''Breaking Open the Head: A Psychedelic Journey into the Heart of Contemporary Shamanism'' is a book written by author and journalist Daniel Pinchbeck, founding editor of the literary journal ''Open City''. Published in 2002, ''Breaking Open th ...
'' (2002), and in a 2003 article for ''
The Guardian ''The Guardian'' is a British daily newspaper. It was founded in 1821 as ''The Manchester Guardian'', and changed its name in 1959. Along with its sister papers ''The Observer'' and ''The Guardian Weekly'', ''The Guardian'' is part of the Gu ...
'' titled "Ten years of therapy in one night".


Television drama

Ibogaine factors into the stories of these episodes from television drama series: * * * * * * *


Radio

* — A former heroin addict realizes that he wants to help other addicts kick their habits. The problem is, he wants to do this using a hallucinogenic drug - ibogaine - that is completely illegal, and which requires medical expertise he doesn't have.


Research


Addiction treatment

The most-studied therapeutic effect of ibogaine is the reduction or elimination of
addiction Addiction is a neuropsychological disorder characterized by a persistent and intense urge to engage in certain behaviors, one of which is the usage of a drug, despite substantial harm and other negative consequences. Repetitive drug use o ...
to
opioid Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, replacement therapy for opioid us ...
s. An integral effect is the alleviation of symptoms of opioid
withdrawal Withdrawal means "an act of taking out" and may refer to: * Anchoresis (withdrawal from the world for religious or ethical reasons) * ''Coitus interruptus'' (the withdrawal method) * Drug withdrawal * Social withdrawal * Taking of money from a ban ...
. Research also suggests that ibogaine may be useful in treating dependence on other substances such as
alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of sev ...
,
methamphetamine Methamphetamine (contracted from ) is a potent central nervous system (CNS) stimulant that is mainly used as a recreational drug and less commonly as a second-line treatment for attention deficit hyperactivity disorder and obesity. Methamph ...
, and
nicotine Nicotine is a natural product, naturally produced alkaloid in the nightshade family of plants (most predominantly in tobacco and ''Duboisia hopwoodii'') and is widely used recreational drug use, recreationally as a stimulant and anxiolytic. As ...
, and may affect compulsive behavioral patterns not involving substance abuse or chemical dependence. Researchers note that there remains a "need for systematic investigation in a conventional clinical research setting." Many users of ibogaine report experiencing visual phenomena during a waking dream state, such as instructive replays of life events that led to their addiction, while others report therapeutic
shaman Shamanism is a religious practice that involves a practitioner (shaman) interacting with what they believe to be a spirit world through altered states of consciousness, such as trance. The goal of this is usually to direct spirits or spiritu ...
ic visions that help them conquer the fears and negative emotions that might drive their addiction. It is proposed that intensive counseling, therapy, and aftercare during the interruption period following treatment is of significant value. Some individuals require a second or third treatment session with ibogaine over the course of 12 to 18 months. A minority of individuals relapse completely into opiate addiction within days or weeks. A comprehensive article (Lotsof 1995) on the subject of ibogaine therapy detailing the procedure, effects, and aftereffects is found in "Ibogaine in the Treatment of Chemical Dependence Disorders: Clinical Perspectives". Ibogaine has also been reported in multiple small-study cohorts to reduce cravings for methamphetamine. There is also evidence that this type of treatment works with
LSD Lysergic acid diethylamide (LSD), also known colloquially as acid, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory perception. At sufficiently high dosages LSD manifests primarily mental, vi ...
, which has been shown to have a therapeutic effect on alcoholism. Both ibogaine and LSD appear to be effective for encouraging introspection and giving the user occasion to reflect on the sources of their addiction, while also producing an intense, transformative experience that can put established patterns of behavior into perspective; ibogaine has the added benefit of preventing withdrawal effects.


Chronic pain management

In 1957, Jurg Schneider, a pharmacologist at CIBA (now a division of
Novartis Novartis AG is a Swiss-American multinational pharmaceutical corporation based in Basel, Switzerland and Cambridge, Massachusetts, United States (global research).name="novartis.com">https://www.novartis.com/research-development/research-loc ...
), found that ibogaine potentiated
morphine Morphine is a strong opiate that is found naturally in opium, a dark brown resin in poppies (''Papaver somniferum''). It is mainly used as a analgesic, pain medication, and is also commonly used recreational drug, recreationally, or to make ...
analgesia Pain management is an aspect of medicine and health care involving relief of pain (pain relief, analgesia, pain control) in various dimensions, from acute and simple to chronic and challenging. Most physicians and other health professionals ...
. No additional data was ever published by CIBA researchers on ibogaine–opioid interactions. Almost 50 years later, Patrick Kroupa and Hattie Wells released the first treatment protocol for concomitant administration of ibogaine with
opioids Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, replacement therapy for opioid use ...
in human subjects, indicating that ibogaine reduced tolerance to opioid drugs. Their paper in the ''
Multidisciplinary Association for Psychedelic Studies The Multidisciplinary Association for Psychedelic Studies (MAPS) is an American nonprofit organization working to raise awareness and understanding of psychedelic substances. MAPS was founded in 1986 by Rick Doblin and is now based in San Jose, C ...
'' journal demonstrated that administration of low "maintenance" doses of ibogaine HCl with
opioids Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia. Other medical uses include suppression of diarrhea, replacement therapy for opioid use ...
decreases
tolerance Tolerance or toleration is the state of tolerating, or putting up with, conditionally. Economics, business, and politics * Toleration Party, a historic political party active in Connecticut * Tolerant Systems, the former name of Veritas Software ...
, but noted that ibogaine's potentiating action could make this a risky procedure.


Psychotherapy

Ibogaine has been used as an adjunct to
psychotherapy Psychotherapy (also psychological therapy, talk therapy, or talking therapy) is the use of psychological methods, particularly when based on regular personal interaction, to help a person change behavior, increase happiness, and overcome pro ...
by
Claudio Naranjo Claudio Benjamín Naranjo Cohen (24 November 1932 – 12 July 2019) was a Chilean-born psychiatrist who is considered a pioneer in integrating psychotherapy and the spiritual traditions. He was one of the three successors named by Fritz Perls ( ...
, documented in his book ''The Healing Journey''. He was awarded patent in 1974.


Treatment of Brain Injuries

Some investigation is being done into the use of psychedelic substances, including Ibogaine, for the treatment of
Traumatic brain injury A traumatic brain injury (TBI), also known as an intracranial injury, is an injury to the brain caused by an external force. TBI can be classified based on severity (ranging from mild traumatic brain injury TBI/concussionto severe traumatic b ...


See also

*
Coronaridine Coronaridine, also known as 18-carbomethoxyibogamine, is an alkaloid found in ''Tabernanthe iboga'' and related species, including ''Tabernaemontana divaricata'' for which (under the now obsolete synonym ''Ervatamia coronaria'') it was named. Li ...
* Ibogaline *
Ibogamine Ibogamine is an anti-convulsant, anti-addictive, CNS stimulant alkaloid found in ''Tabernanthe iboga'' and Crepe Jasmine (''Tabernaemontana divaricata''). Basic research related to how addiction affects the brain has used this chemical. Ibogamin ...
*
Pinoline Pinoline is a methoxylated tryptoline (5-methoxytryptoline) long claimed to be produced in the pineal gland during the metabolism of melatonin, however its pineal occurrence remains controversial. Its IUPAC name is 6-methoxy-1,2,3,4-tetrahydro ...
*
Tabernanthine Tabernanthine is an alkaloid found in ''Tabernanthe iboga''. It has been used in laboratory experiments to study how addiction affects the brain. Tabernanthine persistently reduced the self-administration of cocaine and morphine in rats. Phar ...
*
Voacangine Voacangine (12-methoxyibogamine-18-carboxylic acid methyl ester) is an alkaloid found predominantly in the root bark of the ''Voacanga africana'' tree, as well as in other plants such as ''Tabernanthe iboga'', ''Tabernaemontana africana'', ''Trach ...


References

{{Tryptamines Alkaloids found in Apocynaceae Alkaloids found in Iboga Dream Drug rehabilitation Entheogens HERG blocker Indole alkaloids Nicotinic antagonists NMDA receptor antagonists Oneirogens Phenol ethers Plant toxins Serotonin receptor agonists Sigma agonists Tryptamines VMAT inhibitors