This review is permanently wirhdrawn. A new review, of individual patient data, is in preparation. In the meantime, for more information on tacrine, readers might refer to Qizilbash N, Whitehead A, Higgins J, Wilcock G, Schneider L, Farlow M. Cholinesterase inhibition for Alzheimer disease: a meta‐analysis of the tacrine trials. Dementia Trialists' Collaboration. JAMA. 1998; 280: 20: 1777‐82

The editorial group responsible for this previously published document have withdrawn it from publication.