I don't think MDMA or ketamine count as psychedelics. They are psychoactive, but not psychedelic. MDMA is a stimulant and ketamine is a dissociative anesthetic. Psilocybin is indeed a psychedelic, though.
if your definition of "psychedelic" is "drug that makes you see weird stuff", then sure, ketamine and MDMA can be psychedelics. but some people use a stricter definition based on chemistry and/or mechanism of action. under this definition, MDMA is pretty different than LSD, and ketamine is very different from both.
> some people use [[a stricter definition]], based on chemistry and/or mechanism of action. under [[this definition]]
Can you please explicitly state that definition?, is what I am asking. If not, then we'd only be arguing over a vague, moving target.
The Wikipedia article[0] contains this quote:
> the term psychedelic is sometimes used more broadly to include various types of hallucinogens or those which are atypical or adjacent to psychedelia such as MDMA or cannabis; this article uses the narrower definition of psychedelics.
as well as other information on the method of action that leads to a drug being classified as a psychedelic.
I wasn't previously aware of people referring to MDMA or ketamine as "psychedelics" but I guess it might be more common than I thought. Who knew.