Long-Term Safety Extension With SR57667B in Patients With Alzheimer's Disease

Inclusion Criteria: * Patients who have participated in Study EFC5286 and completed the study. * Patient, identified caregiver and, if applicable, patient surrogate (primary relative, legal guardian, medical proxy) have given their informed written consent and are capable of following study procedures specifically for this LTS5283 extension. Exclusion Criteria: * Females who are pregnant or breast-feeding. * Females of child bearing potential (premenopausal female biologically capable of becoming pregnant) must have a confirmed negative serum b-HCG pregnancy test at the screening visit,and must use an acceptable method of birth control.