Serotonin is a vasoconstrictor. A lack of this neurotransmitter is associated with depression.
One treatment for depression is to take medications that increase the serotonin level. Examples of these medications include Paxil, Prozac and Celexa to name a few.
An overdose of these meds may cause Serotonin Syndrome. Symptoms of Serotonin Syndrome include:
A rapid onset of clonus, shivering and sweating, fever, confusion and agitation.
Treatment of Serotonin Syndrome includes benzodiazepines, cooling down the patient , and cyproheptadine ( an anti-histamine).