Tramadol is a weaker opioid with NDMA (antidepressant) properties.
I have never heard the stacking theory either. Can anyone support the claim that such a method would result in more O-Desmethyltramadol from the tramadol?
JadedTabs, depending on your tolerance to opioids you should be feeling the effect now. But be aware that tramadol is different from other opioids, as you see from several posts here. And you should avoid dosing higher in the chase of more effects and you risk getting seizures caused by tramadol.
A quick Google search should give you your answer.
OD is for intermediateharm reduction questions!