A Case of Neuroleptic Malignant Syndrome in the Context of Lithium Toxicity and Aripiprazole Use

Abstract

Objective Neuroleptic malignant syndrome (NMS) is a rare life-threatening condition that providers should be cognizant of when prescribing dopamine-receptor antagonists. Atypical antipsychotic agents were initially considered to have a lower risk of inducing the development of NMS compared with conventional antipsychotic. Considerable evidence, however, has suggested that atypical antipsychotics are associated with NMS, including the partial dopamine agonist, aripiprazole. There is growing evidence that other psychotropics, including lithium, cause this condition. Here, the authors present a case of a patient who developed NMS from lithium and aripiprazole and provide a literature review of reported NMS cases with either psychotropic. Method and Results The authors report the case of 60-year-old male patient who developed NMS over a hospital course during which both aripiprazole and lithium were prescribed. In addition, a literature review was performed and a summary of cases of NMS induced by either lithium and/or aripiprazole is provided. Conclusions This case adds to the growing body of literature of aripiprazole and lithium-induced NMS. Only 2 other cases are reported where concomitant aripiprazole and lithium use lead to NMS. Interestingly, our patient did develop lithium toxicity during hospitalization, but the NMS diagnosis occurred after lithium toxicity resolved. This varies from the other 2 cases where NMS developed despite lithium levels always being therapeutic. Unfortunately, there are more questions than answers surrounding this rare complication involving these 2 psychotropics and clinical vigilance is warranted when using these psychotropics especially in cases where aripiprazole and lithium are used in combination.