I am a bit confused as to why this is. I would think SSRI's would have the exact opposite effect and increase the effects. It is my understanding that SSRI's prevent serotonin from being reuptaked, leaving more serotonin in your brain. Therefore, since MDMA releases serotonin, wouldn't being on SSRI's leave more of that serotonin flooding throughout your brain? I think of it like this... MDMA releases serotonin, SSRI's prevent the serotonin from being reuptaken, so more serotonin in your brain, right? Wouldn't more serotonin = more euphoria? I don't get it...