DXM    Dextromethorphan (also known as Dex, DXM, Robo, Skittles, Tussin, Triple C) is a dissociative anesthetic drug found in many over-the-counter (OTC) cough and cold medications. Maximum-strength or extra-strength cough syrups that contain DXM have higher potential for abuse by adolescents and young people. Although recommended doses of DXM relieve coughing, much higher doses can produce euphoria, hallucinatory effects and a sense of dissociation similar to that produced by PCP or ketamine. Individuals who become addicted to the drug may develop tolerance to the drug and may require 1000mg or more to get the desired effect.