DXM: Do not mix Ecstasy with DXM (found in several cough
represents, but also in some adulterated ecstasy-pills). Mixing MDMA
(Ecstasy) and DXM can lead to DEATH. This is because both
drugs are metabolised through the same liver enzyme (CYP-2D6) and
inhibit the breakdown of each other. You can easily find out if your
pills contain DXM with a testing kit. For
an external link on general info about DXM click here
Poppers: Do not mix poppers with E,
speed or coke as this can cause heart palpitations (Irregular,
rapid beating or pulsation of the heart.)
Alcohol: Do not mix Ecstasy with
large amounts of alcohol as this can increase the dehydration dangers
quite severely
I am sure there are lots of other drugs you should not mix with MDMA
either. If you know of any, please contact me, and I will ad them up
here