MDMA Comedown
After the high, users of MDMA might experience a serotonin crash leading to feelings of depression. Studies suggest a link between MDMA use and post-drug blues, shedding light on the potential dangers of the substance.In this clip
From this podcast

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Related Questions
Does MDMA deplete serotonin and dopamine afterwards in the episode The Science of MDMA & Its Therapeutic Uses: Benefits & Risks | Huberman Lab Podcast and the clip Understanding MDMA Crash?
Is there evidence that people suffer from low mood the day after doing MDMA, or has that notion been debunked?
Is there a come down after using MDMA?