okay please read all of this. I found it in the directory.
"First of all, both SSRI's (Selective Seratonin Reuptake Inhibitors )(This includes Prozac, Zoloft, Paxil, and the like, and no, there really isn't any difference between them for our purposes here) and Ecstasy both have affinity (Meaning they will interact with and affect) the brain's seratonin reuptake transporters. Seratonin has an extremely important role in brain chemistry, as we all know, and regulates all sorts of things. SSRI's work by stopping the seratonin reuptake in the brain. The idea is for those that are depressed is that by reducing the amount of seratonin reabsorbed back into one's neurochemical system (and thereby increasing the amount of seratonin present), an increased amount of seratonin will help people feel better (With the help of therapy, of course. Very rarely will SSRI's work without the will and help of both the user and his/her doctor.)
Okay, now for the role of Ecstasy. Ecstasy works by flooding the synapse in the brain with seratonin. (again, as we all know.) Because Ecstasy uses the actual reuptake transporter mechanism to cause seratonin release, obviously any sort of chemical (Like an SSRI) blocking that mechanism (Which SSRI's do,) with a higher affinity for it (Like Ecstasy) will severely reduce or completely eliminate the affects of the Ecstasy. Ecstasy (beyond the threshold dose of ~40-60mg) without the presence of SSRI's generally drains a large amount of the brain's seratonin for 12-24 hours, and the brain has generally not reached full seratonin levels for up to a week afterwards.
SSRI's "downregulate" (inhibit the efficiency & the ability) of seratonin reuptake transporters. This means SSRI's affect your brain's seratonin system in a negative way as well as a positive way; the idea is that the positive effects outweigh the negative i.e. higher seratonin levels outweight the fact that your brain isn't using it as efficiently. Basically this means that even for MONTHS after one quits taking an SSRI, the brain is less efficient at using seratonin. Those who go off SSRI's and take E, even MONTHS later, will most likely have a REDUCED roll, regardless of the amount of E you take. Essentially, your brain's maximum of seratonin concentration (what makes rolling feel good) goes DOWN. "
There is your answer. If you want more info on this, there is more in the directory.