NIDA for Teens: The Science Behind Drug Abuse
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Hallucinogens

Actions of PCP in the Brain

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PCP prevents the actions normally caused when a neurotransmitter, called glutamate, attaches to its receptor in the brain. It also disrupts the actions of other neurotransmitters.

This drug’s effects are very unpredictable. For example, it may make some people hallucinate and become aggressive, while others may become drowsy and passive. It is also addictive.