Recieved some Mephedrone the other day. Its not the crystaly stuff, its powdery with some rocks in it. Anyway, bombed 250mg an hour ago, minima,l effects. Just did another 150mg bombed and still feeling nothing at all. I ate about 7 so maybe that has something to do with it. The first time i took mephedrone in the powdery form i only did 200mg bombs and i was loving it!! Im thinking i need to up the initial bomb to 400mg. Am i building up a tolerance to it?? Any similar experiences anyone?????