Long story short I can't get high on codeine what so ever. My highest dose was 400mg and I only felt sightly high(probably placebo) any lower I wouldn't feel it. I'm also really sensitive to DXM low doses like 200mg send me flying and I always looked the most fucked up while on it and most of these symptoms happens to be CYP2D6 enyzme defect. To anyone can't get high on codeine does oxycodone or other opiates work for you? I heard oxycodone is very active on it's own without converting it to oxymorphone (only a small amount gets converted anyways). Also does kratom work for you as well?