When serotonin, a typical chemical present in excess in the body, serotonin syndrome develops.
It is typically brought on by using substances or medicines that impair serotonin levels. The basic treatment for serotonin syndrome involves stopping the drugs that are responsible. A mild case of serotonin syndrome involves less severe symptoms such as feelings of nervousness, ease of vomiting (nausea), diarrhea, tremors (involuntary shaking of limbs), and dilation of the pupil.