Aim:

To describe a clinical case of a patient treated with quetiapine at high dose of long duration in which it produced an atypical adverse reaction.

Description of the clinical case:

An 82-year-old woman institutionalized in a nursing home for the elderly, went to the emergency room with the next symptoms; fever (39º), spasticity and change in mental state. After excluding other pathologies, she was diagnosed NMS. Pharmacological treatment at the time of admission a dose of quetiapine 400mg/24h attracted attention; which was confirmed with her center of residence due to discrepancies with her electronic prescription. According to medical reports, the patient had received this treatment for two months before admission, although NMS is an uncommon side effect among antipsychotics with fatal consequences. Hospitalization first´s day, quetiapine was discontinued and she received specific treatment for NMS, consisting of dantrolene, fluid therapy and supportive care. The NMS was resolved after 3 days.

Discussion:

Although atypical antipsychotics (AA) are considered safer because of their low potency in blocking D2 receptors, they can cause NMS even when prescribed in monotherapy. Therefore, a follow-up of chronic treatments is essential, especially in older people with a basic cognitive impairment.

This case emphasizes the importance of medical-pharmaceutical communication´s to promote patient safety and the importance of reporting.

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