More than three million 12- to 25-year-olds have tried to get high on over-the-counter cough medicines containing dextromethorphan at some point in their lives, a large survey found.

When taken in large amounts, dextromethorphan can produce hallucinations or dissociative, "out-of-body" experiences similar to those caused by the hallucinogens phencyclidine and ketamine, and can cause other adverse health effects, said the government report. The standard cough suppressant dose in adults is 20 mg.

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Source:MedPageToday.Com