• Psychosomatics · May 2010

    Review

    The role of methylene blue in serotonin syndrome: a systematic review.

    • Bradley K W Ng and Andrew J D Cameron.
    • correspondence and Aged Care Mental Health, Robina Hospital, Gold Coast Health Service District, Locked Bag 15, Robina, QLD 4226, Australia. bkwng@hotmail.com
    • Psychosomatics. 2010 May 1; 51 (3): 194-200.

    BackgroundA recent series of case reports has demonstrated a significant, previously unrecognized drug interaction between serotonin reuptake inhibitors (SRIs) and methylene blue (MB).ObjectiveThe authors review the case reports and clinical audits relevant to this interaction and consider the diagnosis of serotonin syndrome in these cases.MethodArticles were obtained from a systematic search of MEDLINE and PsychInfo databases, and from the bibliographies of relevant articles. Studies were considered relevant if the patient received MB and developed an acute confusional state, neuropsychiatric complications, or autonomic instability.ResultsThe review identified nine case reports and two retrospective reviews; 26 patients developed an acute confusional state after MB infusion; 24 of these patients were taking an SRI, and 1 was taking clomipramine. Serotonin syndrome was a possible diagnosis in all 25 of these patients.ConclusionSRIs can interact with MB, causing a serious adverse reaction consistent with serotonin syndrome.

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