Stimulants - Stimulants enhance respiration level which permits a higher dose of opiates than would normally be applied. In case the stimulant wears off initially then the opiate might get over the user and result in respiratory arrest.Flipping the way on the R2 and R1 bonds results in the R- and S- enantiomers of O-Desmethyltramadol. O-DMST is alm