 This study found that dexmodetamidine was most effective at reducing postoperative delirium when compared to other drugs. It also found that combinations of propofol and acetaminophen, ketamine and dexmodetamidine, and diazepam, flunatrazapam, and pethidine were also effective at reducing postoperative delirium. This article was authored by Jun Emol Lee, Yijin Chil, Boon Jinan, and others.