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Many people experience severe depression.

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One part of the treatment of depression is to give antidepressants, which work for many people.

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Antidepressant drugs work to keep the neurotransmitters serotonin and norepinephrine around in the synapse for a much longer time.

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They do not allow these neurotransmitters to reenter the presynaptic neuron.

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The cells that produce these neurotransmitters start in the brain stem and travel widely through the forebrain and limbic system.