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Mechanism related to synaptic transmission

Fluoxetine is an antidepressant drug which presents an action mechanism related to synaptic transmission. What is that mechanism describe properly?

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Fluoxetine is a substance which inhibits re-uptake of the serotonin, a neurotransmitter which acts mainly in central nervous system. By inhibiting the re-uptake of neurotransmitter the drug raises its accessibility in the synaptic cleft therefore improving the neuronal transmission.

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