Dextromethorphan is similar to PCP and ketamine, all antagonize nmda receptors. In low doses these drugs are similar to alcohol intoxication with a sensory strobing effect, higher doses producing anesthetic effects which can include hallucinations. Cough syrup can have other components like tylenol doxylamine and phenylephrine; all three of which can kill you in overdose.
Some cough syrups contain codeine which is a mild opiate.
And people have started drinking strait promethazine -which is an antipsychotic that causes severe drowsiness.
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