Free of charge and conjugated noroxycodone, cost-free and conjugated oxycodone, and oxymorphone are excreted in human urine pursuing only one oral dose of oxycodone. The key circulating metabolite is noroxycodone by having an AUC ratio of 0.6 relative to that of oxycodone. Oxymorphone is present within the plasma only in lower concentrations. The a