Abstract:
:Neuroleptic malignant syndrome (NMS) is an idiosyncratic and uncommon but serious adverse effect that has been reported with both typical and atypical antipsychotic agents. We describe a 58-year-old man with Down syndrome and dementia who was receiving low-dose olanzapine and rivastigmine therapy; he developed NMS 4 months after starting olanzapine. The patient presented with altered mental status, rigidity, fever, diaphoresis, and tremor, and his creatine kinase level was elevated. Olanzapine was discontinued, and the patient fully recovered; antipsychotic therapy was not restarted. Based on the Naranjo adverse drug reaction probability scale, olanzapine was the probable cause of the patient's NMS. In addition, use of rivastigmine in combination with olanzapine may have placed the patient at greater risk for NMS, possibly due to an acetylcholine-dopamine imbalance. Clinicians should be aware of the potential for NMS even with low doses of antipsychotics, particularly in patients who have a limited ability to communicate. Concomitant administration of cholinesterase inhibitors such as rivastigmine may represent an unrecognized risk factor for NMS development.
journal_name
Pharmacotherapyjournal_title
Pharmacotherapyauthors
Stevens DL,Lee MR,Padua Ydoi
10.1592/phco.28.3.403subject
Has Abstractpub_date
2008-03-01 00:00:00pages
403-5issue
3eissn
0277-0008issn
1875-9114journal_volume
28pub_type
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