How long does it take for K to leave your body?
                                
                                
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                                    4 min read                                
                            
                                Ketamine, often called "K" or "Special K," has a very short elimination half-life of roughly 2.5 to 3 hours in adults, meaning the parent drug is eliminated from the bloodstream relatively quickly. However, the time it remains detectable through drug testing is far longer due to its metabolites.