Look your pills up before you take them.
Dancesafe
Ecstasy Data
Good ecstasy contains MDMA, though there are various other MDxx chemicals( such as MDA or MDE that some people prefer) which are similar to MDMA in chemical structure and effect.

Also check on pillreports.com

Erowid MDMA Vault
Nullific Reviewed by Nullific on . XTC first time... This weekend im gonna roll for the first time, any advice anyone has would be greatly appriciated, thanks p.s. i was wondering if i should take 2 or 1 i was talking to some kid and he said he recomends 2 for your first time if you wanna have a really good time but im not sure?!?! Rating: 5