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IUPAC name
Other names 2,5-Dimethoxy-4-methylamphetamine
CAS number 26011-50-7,(R): 43061-13-8
(S): 43061-14-9
Molecular formula C12H19NO2
Molar mass 209.29 g/mol
Melting point

61 °C, 334 K, 142 °F

Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

2,5-Dimethoxy-4-methylamphetamine (DOM or STP, allegedly standing for Serenity, Tranquility and Peace, but based on the motor oil company STP as named by Owsley Stanley) is a psychedelic (hallucinogenic drug) and a substituted amphetamine. It was first synthesized by Alexander Shulgin, and later reported in his book PiHKAL (Phenethylamines i Have Known And Loved). DOM is classified as a Schedule I substance in the United States, and is similarly controlled in other parts of the world. Internationally, it is a Schedule I drug under the Convention on Psychotropic Substances.[1] It is generally taken orally.



In mid-1967, tablets containing 20 mg (later 10 mg) of DOM were widely distributed in the Haight-Ashbury District of San Francisco under the name of STP. This short-lived appearance of DOM on the black market proved disastrous for several reasons. First, the tablets contained an excessively high dose of the chemical. This, combined with DOM’s slow onset of action (which encouraged some users, familiar with drugs that have quicker onsets, such as LSD, to re-dose) and its remarkably long duration, caused many users to panic and sent some to the emergency room. Second, treatment of such overdoses was complicated by the fact that no one at the time knew that the tablets called STP were, in fact, DOM.


Side effects of this drug include substantial perceptual changes such as blurred vision, multiple images, vibration of objects, visual hallucinations, distorted shapes, enhancement of details, slowed passage of time, and increased contrasts. It may also cause pupillary dilation and a rise in systolic blood pressure.[2]


DOM is a selective 5-HT2A, 5-HT2B, and 5-HT2C receptor partial agonist. Its psychedelic effects are mediated by its agonistic properties at the 5-HT2A receptor. Due to its selectivity, DOM is often used in scientific research when studying the 5-HT2 receptor subfamily. DOM is a chiral molecule, and R-(-)-DOM is the more active enantiomer, functioning as a potent agonist of the serotonin 5-HT family of receptors; mainly of the 5-HT-2 subtype.[3]

The 2,6-dimethoxy analogue of DOM, known as Ψ-DOM, is also known to be active.


Very little is known about the toxicity of DOM. According to Shulgin, the effects of DOM typically last 14 to 20 hours, though other clinical trials indicate a duration of 7 to 8 hours.[2]

See also


  1. ^ "List of psychotropic substances under international control". Retrieved 2007-03-30.  
  2. ^ a b Snyder, Solomon H.; Louis Faillace and Leo Hollister (November 1967). "2,5-Dimethoxy-4-methyl-amphetamine (STP): A New Hallucinogenic Drug". Science 158 (3801): 669–670.  
  3. ^ Sanders-Bush, E; Burris, KD; Knoth, K (1988). "Lysergic acid diethylamide and 2,5-dimethoxy-4-methylamphetamine are partial agonists at serotonin receptors linked to phosphoinositide hydrolysis". The Journal of pharmacology and experimental therapeutics 246 (3): 924–928.  

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