A cocaine user experiences a decline in mood or "crash" because when cocaine levels drop, the

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Cocaine blocks the reuptake of neurotransmitters, including dopamine and serotonin, causing an excess of these neurotransmitters in the synaptic cleft. However, when cocaine levels drop, the receiving neurons absorb fewer neurotransmitters, leading to a decline in mood or "crash" as the brain attempts to restore a balance of neurotransmitters.

A Cocaine User Experiences a Decline in Mood or "Crash