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TIHKAL: The Continuation
Cover of TIHKAL, 1st ed.
Author Alexander and Ann Shulgin
CountryUnited States
Subject Pharmacology, Autobiography, Psychedelic drugs
PublisherTransform Press
Publication date
Media typePaperback
Pagesxxviii, 804 p.
ISBN 0-9630096-9-9
OCLC 38503252
Preceded by PIHKAL  

TIHKAL: The Continuation is a 1997 book written by Alexander Shulgin and Ann Shulgin about a family of psychoactive drugs known as tryptamines. A sequel to PIHKAL: A Chemical Love Story , TIHKAL is an acronym that stands for "Tryptamines I Have Known and Loved".



TIHKAL, much like its predecessor PIHKAL, is divided into two parts. The first part, for which all rights are reserved, begins with a fictionalized autobiography, picking up where the similar section of PIHKAL left off; it then continues with a collection of essays on topics ranging from psychotherapy and the Jungian mind to the prevalence of DMT in nature, ayahuasca and the War on Drugs. The second part of TIHKAL, which may be conditionally distributed for non-commercial reproduction (see external links below), is a detailed synthesis manual for 55 psychedelic compounds (many discovered by Alexander Shulgin himself), including their chemical structures, dosage recommendations, and qualitative comments. Shulgin has made the second part freely available on Erowid.org while the first part is available only in the printed text.

Like PIHKAL, the Shulgins were motivated to release the synthesis information as a way to protect the public's access to information about psychedelic compounds, a goal Alexander Shulgin has noted many times. [1] Following a raid of his laboratory in 1994 by the United States DEA, [2] Richard Meyer, spokesman for DEA's San Francisco Field Division, stated that "It is our opinion that those books [referring to the previous work, PIHKAL ] are pretty much cookbooks on how to make illegal drugs. Agents tell me that in clandestine labs that they have raided, they have found copies of those books."

Tryptamines listed

SubstanceChemical name
1 AL-LAD 6-Allyl-N,N-diethyl-NL
2 DBT N,N-Dibutyl-T
3 DET N,N-Diethyl-T
4 DiPT N,N-Diisopropyl-T
5 alpha,O-DMS 5-Methyoxy-alpha-methyl-T
6 DMT N,N-Dimethyl-T
7 2,alpha-DMT 2,alpha-Dimethyl-T
8 alpha,N-DMT alpha,N-Dimethyl-T
9 DPT N,N-Dipropyl-T
10 EiPT N-Ethyl-N-isopropyl-T
11 AET alpha-Ethyl-T
12 ETH-LAD 6,N,N-Triethyl-NL
13 Harmaline 3,4-Dihydro-7-methoxy-1-methyl-C
14 Harmine 7-Methyoxy-1-methyl-C
15 4-HO-DBT N,N-Dibutyl-4-hydroxy-T
16 4-HO-DET N,N-Diethyl-4-hydroxy-T
17 4-HO-DiPT N,N-Diisopropyl-4-hydroxy-T
18 4-HO-DMT N,N-Dimethyl-4-hydroxy-T
19 5-HO-DMT N,N-Dimethyl-5-hydroxy-T
20 4-HO-DPT N,N-Dipropyl-4-hydroxy-T
21 4-HO-MET N-Ethyl-4-hydroxy-N-methyl-T
22 4-HO-MiPT 4-Hydroxy-N-isopropyl-N-methyl-T
23 4-HO-MPT 4-Hydroxy-N-methyl-N-propyl-T
24 4-HO-pyr-T 4-Hydroxy-N,N-tetramethylene-T
25 Ibogaine A complexly substituted-T
26 LSD N,N-Diethyl-L
27 MBT N-Butyl-N-methyl-T
28 4,5-MDO-DiPT N,N-Diisopropyl-4,5-methylenedioxy-T
29 5,6-MDO-DiPT N,N-Diisopropyl-5,6-methylenedioxy-T
30 4,5-MDO-DMT N,N-Dimethyl-4,5-methylenedioxy-T
31 5,6-MDO-DMT N,N-Dimethyl-5,6-methylenedioxy-T
32 5,6-MDO-MiPT N-Isopropyl-N-methyl-5,6-methylenedioxy-T
33 2-Me-DET N,N-Diethyl-2-methyl-T
34 2-Me-DMT 2,N,N-Trimethyl-T
35 Melatonin N-Acetyl-5-methoxy-T
36 5-MeO-DET N,N-Diethyl-5-methoxy-T
37 5-MeO-DiPT N,N-Diisopropyl-5-methoxy-T
38 5-MeO-DMT 5-Methoxy-N,N-dimethyl-T
39 4-MeO-MiPT N-Isopropyl-4-methoxy-N-methyl-T
40 5-MeO-MiPT N-Isopropyl-5-methoxy-N-methyl-T
41 5,6-MeO-MiPT 5,6-Dimethoxy-N-isopropyl-N-methyl-T
42 5-MeO-NMT 5-Methoxy-N-methyl-T
43 5-MeO-pyr-T 5-Methoxy-N,N-tetramethylene-T
44 6-MeO-THH 6-Methoxy-1-methyl-1,2,3,4-tetrahydro-C
45 5-MeO-TMT 5-Methoxy-2,N,N-trimethyl-T
46 5-MeS-DMT N,N-Dimethyl-5-methylthio-T
47 MiPT N-Isopropyl-N-methyl-T
48 a-MT alpha-Methyl-T
49 NET N-Ethyl-T
50 NMT N-Methyl-T
51 PRO-LAD 6-Propyl-NL
52 pyr-T N,N-Tetramethylene-T
53 T Tryptamine
54 Tetrahydroharmine 7-Methoxy-1-methyl-1,2,3,4-tetrahydro-C
55 alpha,N,O-TMS alpha,N-Dimethyl-5-methoxy-T

See also


  1. Bennett, Drake (2005-01-30). "Dr. Ecstasy". New York Times Magazine. New York Times . Retrieved 2006-07-08.
  2. "DEA Raid of Shulgin's Laboratory". Erowid. 2004-01-08. Retrieved 2006-07-08.

Related Research Articles

Alexander Shulgin American medicinal chemist (1925–2014)

Alexander Theodore Shulgin was an American medicinal chemist, biochemist, organic chemist, pharmacologist, psychopharmacologist, and author. He is credited with introducing MDMA to psychologists in the late 1970s for psychopharmaceutical use and for the discovery, synthesis and personal bioassay of over 230 psychoactive compounds for their psychedelic and entactogenic potential.


PiHKAL: A Chemical Love Story is a book by Dr. Alexander Shulgin and Ann Shulgin, published in 1991. The subject of the work is psychoactive phenethylamine chemical derivatives, notably those that act as psychedelics and/or empathogen-entactogens. The main title, PiHKAL, is an acronym that stands for "Phenethylamines I Have Known And Loved".


2C-T-7 is a psychedelic phenethylamine of the 2C family. In his book PiHKAL: A Chemical Love Story, Alexander Shulgin lists the dosage range as 10 to 30 mg. 2C-T-7 is generally taken orally, and produces psychedelic and entactogenic effects that last 8 to 15 hours. Up until Operation Web Tryp and three deaths, two of which involved the use of other drugs in addition to 2C-T-7, and one which involved an excessive insufflated dose, 2C-T-7 was sold commercially in Dutch and Japanese smartshops and online. It is known on the streets as Blue Mystic or 7th Heaven. There has been little real research done on this chemical other than Shulgin's comments in PiHKAL and a few small animal studies mostly aimed at detecting metabolites.


2C-E is a psychedelic phenethylamine of the 2C family. It was first synthesized by Alexander Shulgin and documented in his book PiHKAL. Like the other substances in its family, it produces sensory and cognitive effects in its physical reactions with living organisms. It is also a powerful vasoconstrictor at high doses.


α-Ethyltryptamine, also known as etryptamine, is a psychedelic, stimulant, and entactogenic drug of the tryptamine class. It was originally developed and marketed as an antidepressant under the brand name Monase by Upjohn in the 1960s.


4-Hydroxy-N,N-diisopropyltryptamine is a synthetic psychedelic drug. It is a higher homologue of psilocin, 4-HO-DET, and is a positional isomer of 4-HO-DPT and has a tryptamine molecular sub-structure.


2C-P is a relatively potent and long acting psychedelic phenethylamine of the 2C family.

Ann Shulgin

Ann Shulgin is an American author and the widow of chemist Alexander Shulgin, with whom she wrote PiHKAL and TiHKAL.

4-HO-MiPT Chemical compound

4-HO-MiPT is a synthetic substituted aromatic compound and a lesser-known psychedelic tryptamine. It is thought to be a serotonergic psychedelic, similar to magic mushrooms, LSD and mescaline. Its molecular structure and pharmacological effects somewhat resemble those of the tryptamine psilocin, which is the primary psychoactive chemical in magic mushrooms.


2,5-Dimethoxy-4-chloroamphetamine (DOC) is a psychedelic drug of the phenethylamine and amphetamine chemical classes. It was presumably first synthesized by Alexander Shulgin, and was described in his book PiHKAL.


2C-T is a psychedelic and hallucinogenic drug of the 2C family. It is used by some as an entheogen. It has structural and pharmacodynamic properties similar to the drugs mescaline and 2C-T-2.


PARGY-LAD is an analogue of LSD. It is described by Alexander Shulgin in the book TiHKAL. PARGY-LAD is a hallucinogenic drug similar to LSD, but is considerably less potent than LSD with a dose of 160 micrograms producing only mild effects, and 500 micrograms required for full activity.


2,N,N-Trimethyltryptamine, 2,N,N-TMT, or 2-Me-DMT is a tryptamine derivative that is a psychedelic drug. It was invented by Alexander Shulgin and reported in his book TiHKAL (#34). It is claimed to show psychoactive effects at a dosage of 50–100 mg orally, but these are relatively mild compared to other similar drugs, suggesting that while the 2-methyl group has blocked the binding of metabolic enzymes, it is also interfering with binding to the 5HT2A receptor target that mediates the hallucinogenic effects of these drugs.


5-Methoxy-2,N,N-trimethyltryptamine is a psychoactive drug of the tryptamine chemical class which acts as a psychedelic. It was first synthesized by Alexander Shulgin and reported in his book TiHKAL. 5-MeO-TMT is claimed to show psychoactive effects at a dosage of 75–150 mg orally, but these are relatively mild compared to those of other similar compounds. This suggests that while the methyl group on the 2-position of the molecule has impaired the binding of metabolic enzymes like monoamine oxidase (MAO), it is also interfering with binding to and/or activation of the serotonin 5-HT2A receptor, the target responsible for mediating the hallucinogenic effects of such compounds.


4-Hydroxy-N-methyl-N-propyltryptamine, commonly known as 4-HO-MPT or meprocin, is a psychedelic drug in the tryptamine class of chemical compounds and is a higher homologue of the naturally occurring substituted tryptamine psilocin as well as being the 4-hydroxyl analog of MPT.


4-HO-pyr-T (4-hydroxy-N,N-tetramethylenetryptamine) is a lesser-known psychedelic drug. It is the 4-hydroxyl analog of pyr-T. 4-HO-pyr-T was first synthesized by Alexander Shulgin. In his book TiHKAL, neither the dosage nor the duration are reported. 4-HO-pyr-T produces few to no effects. Very little data exists about the pharmacological properties, metabolism, and toxicity of 4-HO-pyr-T.


5-MeO-pyr-T (5-methoxy-N,N-tetramethylenetryptamine) is a lesser-known psychedelic drug. It is the 5-methoxy analog of pyr-T. 5-MeO-pyr-T was first synthesized by Hunt & Brimblecombe, who credited S. Mitzal for characterization of chemical properties. Later human tests were reported by Alexander Shulgin, in his book TiHKAL. An oral dosage of 0.5 to 2 mg, and an inhaled dosage of 2–3 mg are reported. 5-MeO-pyr-T causes varying reactions, such as amnesia, tinnitus, vomiting, and a 5-MeO-DMT-like rushing sensation. At the highest dosage reported in TiHKAL, the subject describes awakening from an apparent fugue state during which they were wandering the streets, with complete amnesia upon awakening.


2,alpha-DMT, or 2,α-dimethyltryptamine, is a tryptamine and a lesser-known psychedelic drug. It is the 2,a-dimethyl analog of DMT. 2,α-DMT was first synthesized by Alexander Shulgin. In his book TiHKAL, Shulgin lists the dosage as 300-500 mg, and the duration as 7–10 hours. 2,α-DMT causes mydriasis and paresthesia. It also produces a calm, drunk-like feeling. Very little data exists about the pharmacological properties, metabolism, and toxicity of 2,α-DMT.


Alpha,N-DMT, or α,N-dimethyltryptamine, is a lesser-known psychedelic drug. It is the α,N-dimethyl analog of DMT. α,N-DMT was first synthesized by Alexander Shulgin. In his book TiHKAL, Shulgin lists the dosage as 50-100 mg, and the duration as 6–8 hours. α,N-DMT causes an unpleasant body load. Very little data exists about the pharmacological properties, metabolism, and toxicity of α,N-DMT.


Alpha,N,O-TMS, or α,N-dimethyl-5-methoxytryptamine, is a lesser-known psychedelic drug. Its abbreviated nomenclature is derived from its structure, as it is α,N,O-trimethyl serotonin. α,N,O-TMS was first synthesized by Alexander Shulgin. In his book TiHKAL, Shulgin lists the dosage as 10-20 mg when taken orally, and the duration as 6–8 hours.