I'm not sure if I understand the synergetic effects of MDMA and SSRIs correctly.
According to PMC81503 "It is clear, however, that the increase in the net release of serotonin (and possibly dopamine) is the major mechanism of action underlying the distinctive mental effects of MDMA" but it also states "MDMA does not act by directly releasing serotonin but, rather, by binding to, and thus blocking, the transporter involved in its reuptake."
Do SSRIs interfere with MDMA? Do both bind to SERT, do they compete? Do SSRIs prevent the serotonin released by MDMA from being reuptaken? Do SSRIs increase the net release of MDMA when taken together compared to MDMA alone?