MK0952 in Patients With Mild-to-Moderate Alzheimer's Disease (0952-004)(COMPLETED)

Inclusion Criteria: * Male or females * Age \>/= 55 years, With mild-to-moderate AD, with MMSE between 18 and 26, inclusive, MHIS score \</= 4, Global CDR score of 1 or 2 * Who have a reliable informant/caregiver to accompany patient to all clinic visits * If using a symptomatic AD treatments, patients must be on stable dose for \>/= 6 months Exclusion Criteria: * Patients must not be living in nursing home or skilled nursing facility * Patients must not have current evidence and/or history of Crohn's disease, ulcerative colitis, proctitis, GI bleeding, mesenteric arteritis * Patients must not have current evidence and/or history of poorly-controlled hypertension, clinically significant cardiac arrhythmia, angina, or CHF * Patients must not have current evidence and/or history of a psychotic disorder or major untreated depressive disorder * Patients must not have current evidence and/or history of stroke or multiple lacunar infarcts, or neurological or neurodegenerative disorder (other than AD) * Various concomitant therapy restrictions