Sorry Spork, otherwise very informative but "3,4 Methylenedioxy-methamphetamine" is A methamphetamine.
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You are correct.
However, common usage of the word "meth" or "methamphetamine" refers to a different drug entirely -- "crystal", "tina", etc. I was trying to straighten out the people that were equating MDMA with crystal.
So: MDMA is a methamphetamine, but it's not "meth". Yes, it's confusing. And yes, E/X/MDMA does have stimulant effects: you're not going to sleep while you're on it. But it doesn't last nearly as long as crystal, and the effects on you, the user, are worlds apart.
I've seen many, many people completely screw up their lives, and the lives of those around them, on crystal. I haven't seen anything like that with E: the worst I've seen is a month or two of mild depression from someone who quit after a few years of using 2-3x a week. The people I know who are actually depressed or bipolar are much worse off.
If you're really worried about it, taking a Prozac about 2 hours after taking MDMA will block any neurotoxic effects.