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We read with interest the analysis by Reulbach and colleagues regarding the treatment of neuroleptic malignant syndrome (NMS) [1]. In this analysis, the effect of various treatments on clinical outcomes from 271 single case reports was reviewed. It was concluded that dantrolene does not seem to be the evidence-based treatment of choice for NMS.  We have concerns about the methodology employed by the authors, in particular the type of studies included in this analysis. Guidelines for grading the quality of evidence and strength of recommendations for the efficacy of an intervention were recently published, in which the analysis of single case reports is not a recognized approach for evaluating a treatment's efficacy [2]. Furthermore, case series were specifically excluded by Reulbach and colleagues, even though these studies can demonstrate the spectrum of severity and response to treatment, which is more informative. Other shortcomings in the methodology were also observed, and although some were acknowledged by the authors, clinical recommendations were still made.  We acknowledge the difficulties in the treatment of NMS given that the available data are restricted to case reports and small case series and agree that large prospective studies are probably impracticable. However, only limited conclusions can be drawn from any analyses of these data even if 'meta-analysis techniques' are used. This paper is valuable for hypothesis generation and we hope that it will stimulate further discussion. However, recommendations that influence the use of selected agents in the clinical management of NMS are not appropriate on the basis of the present study.

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Conclusions regarding the efficacy of treatments for neuroleptic malignant syndrome should be tempered given poor quality data, regardless of the analysis conducted