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. 
- New Psychoactive Substances (National Drug and Alcohol Research Centre 2014) | https://comorbidity.edu.au/sites/default/files/cre/page/New%20Psychoactive%20Substances.pdf