What ingredients are in the blue extasy pill?

Drug compositions change depending on where they come from and who made them. A yellow pill in one city can be completely different than an yellow pill in another city, even if they have the same stamp on them. The only way to know what is inside the pill is to buy a drug testing kit and test it yourself.

There are also websites such as http://www.ecstasydata.org that have some of the lab testing results online from different cities.