I have experience with the following combinations : oxy+tramadol, oxy+tramadol+codeine, morphine+oxy+tramadol, tramadol + durogesic (fentanyl), durogesic(fentanyl) +tramadol + DHC, tramadol + heroin.,tramadol + codeine ( would not really recommend, it's a waste for one of them, I only feel the tramadol with a low grade of itchiness from the code histamine release), codeine + dhc ( I liked this one more than code on its own, but I preffer DHC anyway over code ) almost everything with tramadol because well I have to use it even if I take another opiate as I feel th snri withdrawal. loved them all really, but none of these combinations are safe. plus a lot of times I added benzos,k and other stuff. with the morphine+oxy+tramadol combo I had problem breathing, one time with the durogesic IV and tramadol orally I OD-ed and was ko for about 30 minutes breathing very slowly, on tramadol with heroin sometimes I had to vomit a lot other times not at all.
right now unfortunately I am on 850 mg tramadol + 160 oxy (2 x 80 mg old formula sandoz ones) + 1.25 mg of alprazolam