What symptom is a hallmark of serotonin syndrome that may arise with certain antiemetics?

Hyperreflexia is a key symptom associated with serotonin syndrome, which can occur in response to certain antiemetics that influence serotonin levels in the brain. Serotonin syndrome is characterized by an excess of serotonin in the central nervous system, leading to a range of neurological symptoms. Hyperreflexia refers to over-responsive reflexes and can be a distinguishing feature of this condition.

In serotonin syndrome, the increased serotonergic activity can heighten the excitability of the neuromuscular system, which manifests as hyperreflexia. This symptom often occurs alongside others, such as agitation, tremors, and changes in mental status, which further illustrate the disorder's neurological disruption. Recognizing hyperreflexia in patients treated with serotonergic drugs, including certain antiemetics, can be crucial for prompt identification and management of serotonin syndrome.