Dextromethorphan (DXM) is a cough suppressant approved by the Food and Drug Administration (FDA) that is found in many over-the-counter (OTC) cough and cold remedies. It is generally safe when taken at recommended doses. When taken in large amounts, though, DXM can produce hallucinations and a “high” similar to psychotropic drugs, such as phencyclidine (PCP). Dangerous side effects may include blurred vision, loss of physical coordination, abdominal pain, and rapid heartbeat. Side effects may be worsened if the ingested product also contains other pharmaceutical ingredients, such as acetaminophen, pseudoephedrine, antihistamines, or expectorants, which are commonly found in cough and cold medicines. In recent years DXM has become available, primarily over the Internet, in bulk powdered form, and concern has grown over the nonmedical use of DXM by teenagers.