Recreational Use of Dextromethorphan - Effects

Effects

Dextromethorphan, when consumed in low "recreational doses" (between 100 & 200 mg), is described as having a euphoric effect. With middle doses (about 400 mg, or 2.5 to 7.5 mg/kg), intense euphoria, vivid imagination, and closed-eye hallucinations may occur. With high doses (600 mg, or 7.5 mg/kg and over), profound alterations in consciousness have been noted, and users often report out-of-body experiences or temporary psychosis. Flanging (speeding up or slowing down) of sensory input is also a characteristic effect of recreational use.

There is also a marked difference between dextromethorphan hydrobromide, contained in most cough suppressant preparations, and dextromethorphan polistirex, contained in the brand name preparation Delsym. Polistirex is polymer that is bonded to the dextromethorphan that requires more time for the stomach to digest it as it requires that an ion exchange reaction take place prior to its dissolution into the blood. Because of this, dextromethorphan polistirex takes considerably longer to absorb, resulting in more gradual and longer lasting effects reminiscent of time release pills. As a cough suppressant, the polistirex version lasts up to 12 hours. This duration also holds true when used recreationally.

In 1981, a paper by Gosselin estimated that the lethal dose is between 50 and 500 mg/kg. Doses as high as 15–20 mg/kg are taken by some recreational users. It is suggested by a single case study that the antidote to dextromethorphan overdose is naloxone, administered intravenously.

In addition to producing PCP-like mental effects, high doses may cause a false-positive result for PCP and opiates in some drug tests.