Drugs that treat depression by manipulating the neurotransmitter serotonin in the brain may also affect the immune system. This is explained by the fact that serotonin is passed between key cells in the immune system, and that it is specifically used to activate an immune response. Selective serotonin reuptake inhibitor drugs may restore a healthy immune function in people who are depressed and prone to infections. Though, the new research findings warn that they might also bolster immunity to the point that they trigger autoimmune disease.
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