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2C-x is the general name for the family of synthetic phenethylamines originally studied by Alexander Shulgin. Shulgin first synthesized most of the 2C-x chemicals in the 1970s and later published his findings in his book PiHKAL. The 2C-x chemicals vary in effect from being totally inactive to fully psychedelic.
List of 2C-x compunds
Health effects, potential addiction and tolerance
The 2C-x chemicals, as with many other serotonergic psychedelics, should not be taken in combination with SSRIs (selective serotonin reuptake Inhibitor) or tricyclic antidepressants in general to avoid Serotonin Syndrome, a potentially life-threatening condition in which an abundance of serotonin is built up the body, causing many physical and cognitive health problems.
- USA: In the US, most of the 2C-x chemicals are Schedule I under the American Food and Drug Administration Safety and Innovation Act of 2012 and the Federal Analogue Act.
- Australia: Australia has a blanket ban over all substituted phenethylamines including the entire 2C-X family.
- Switzerland: Most 2C-x drugs are illegal to possess, produce and sell.
- Canada: All 2C-x phenethylamines are schedule III in Canada. 
- United Kingdom - Most of the 2C-x chemical class are Class A drugs in the United Kingdom as a result of the phenethylamine catch-all clause.
- Dean, B. V., Stellpflug, S. J., Burnett, A. M., & Engebretsen, K. M. (2013). 2C or not 2C: Phenethylamine Designer Drug Review. Journal of Medical Toxicology, 9(2), 172-178. https://doi.org/10.1007/s13181-013-0295-x
- New Psychoactive Substances (National Drug and Alcohol Research Centre 2014) | https://comorbidity.edu.au/sites/default/files/cre/page/New%20Psychoactive%20Substances.pdf
- United Kingdom. (1977). Misuse of Drugs Act 1971 (S.I. 1977/1243). London: The Stationery Office Limited. Retrieved July 5, 2017, from http://www.legislation.gov.uk/uksi/1977/1243/made