All of the following drugs can cause neuroleptic malignant syndrome except:
**Core Concept**
Neuroleptic malignant syndrome (NMS) is a rare but life-threatening neurological disorder caused by an adverse reaction to certain medications, particularly antipsychotics and other dopamine receptor antagonists. It is characterized by fever, muscle rigidity, altered mental status, and autonomic dysfunction.
**Why the Correct Answer is Right**
NMS is typically associated with the use of antipsychotic medications, such as haloperidol and risperidone, which block dopamine receptors in the brain. This blockade can disrupt normal dopamine-mediated functions, leading to the development of NMS. The pathophysiology of NMS involves an imbalance between dopamine and acetylcholine, as well as an increase in excitatory neurotransmitters such as glutamate.
**Why Each Wrong Option is Incorrect**
**Option A:** This drug is not typically associated with NMS, as it is a selective serotonin reuptake inhibitor (SSRI) that does not significantly affect dopamine receptors.
**Option B:** This anticholinergic medication can cause various side effects, but it is not a common cause of NMS.
**Option C:** This drug is not typically associated with NMS, as it is a benzodiazepine that primarily affects the GABA receptor.
**Clinical Pearl / High-Yield Fact**
It's essential to recognize the early signs of NMS, including fever, muscle rigidity, and altered mental status, and to discontinue the offending medication promptly. NMS can be a medical emergency, and prompt treatment is crucial to prevent long-term morbidity and mortality.
**Correct Answer: D.**