people have been takingamp with MDMA for a long long time to not be floored at raves. as far as I can tell they should be taken at the same time. taking amp before can reduce the effects of the MDMA. it can make you hotter and sweat alot more. it can also make you panic, feel shot of breath and have a fast heart rate. The comedown is alot worse and you will have a rough day or 2 after.
Just don't over do it and you will be find. take breaks, drink water, stay cool.