I was wondering if anyone has experience with this combination. I plan on trying it Saturday and wanted some insight as to what to expect. I was hooked on speedballs for a long time, but have not had an opiate or cocaine habit for over a year. However I have been using a lot of mephedrone lately and has quite a tolerance. I plans on using 30mg of roxy and about 120mg of mephedrone in the same shot. (I haven't touched an opiate in six months) Since a lot of mephedrone's magic has worn off, I mostly just get a speedy effect from it. I was wondering if this could be comparable to a speedball. I doesn't need disclaimers about the dangers of shooting pills/meph.