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A condition characterized by a long and intense sensation of pain.

A class of antidepressants that act on serotonin receptors.

A type of anxiety disorder characterized by excessive fear of a particular thing or situation.

Physical and psychological symptoms that occur when you stop taking a drug that the body has become dependent on.

A chemical neurotransmitter linked to mood, appetite and sleep. Serotonin also, as a tissue hormone, causes smooth muscle contraction, and dilates or narrows blood vessels,.