The effects of DXM last for about three to four hours, as stated by Addiction Hope. Although DXM is not physically addictive, it can cause addiction psychologically.
DXM is the nickname for dextromethorphan. A common ingredient in over-the-counter cough medication, it has dissociative properties that can cause hallucinations, according to Addiction Hope.
People, particularly teenagers, turn to DMX abuse because it is cheap and easy to get. When taken in high doses, DXM can cause side effects such as fever, impaired vision, rapid breathing, increased blood pressure and irregular heart rate. Other potential side effects include nausea, speech impairment, memory loss and coma, as reported by WebMD.