Key Message
Variable findings were reported for clinical effectiveness of melatonin for the prevention or treatment of delirium compared with placebo in the literature that met the criteria for this review.
No studies that met the criteria for this review were found on the clinical effectiveness of melatonin for the prevention and/or treatment of delirium versus antipsychotic drugs or cholinergic agents.
There was limited evidence available on the clinical effectiveness of melatonin for the prevention and/or treatment of delirium versus dexmedetomidine.
There were no statistically or clinically significant harms reported from the use of melatonin in the treatment of patients at risk from or experiencing delirium.
Limited guidance was found that provided recommendations for the use of melatonin in the prevention and//or treatment of delirium for hospitalized inpatients.