A number of early reports suggested that the risk of AD was reduced in patients taking an HMG CoA reductase inhibitor (statin) (Wolozin et al. Arch Neurol 2000; 57: 1439-1443, free full text at http://archneur.ama-assn.org/cgi/reprint/57/10/1439; Rockwood et al. Arch Neurol 2002; 59: 223-227, free full text at http://archneur.ama-assn.org/cgi/reprint/59/2/223).