Don't take trazodone when you roll. If you can't roll hard enough on MDMA without adding other serotonin producing drugs, you need a break of at least 90 days
You really don't want to end up like one of the people on this forum who comes in here saying "I mixed MDMA with X-chemical, and now my brain feels fucked up"
serotonin drugs like SSRI's or 5HTP or any kind of serotonin-related drug that is anything more than a simple 5HT2a agonist like LSD do not go with MDMA because of the risk of serotonin syndrome, a very dangerous condition that can be deadly.