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Alzheimer`s & Dementia
Year: 2013  |  Volume: 9  |  Issue: 3  |  Page No.: 338 - 345

Effectiveness of antidementia drugs in delaying Alzheimer's disease progression

Susan D. Rountree, Alireza Atri, Oscar L. Lopez and Oscar L. Lopez    

Abstract: Background Randomized controlled trials (RCTs) provide safety and efficacy data for regulatory approval of antidementia drugs, but offer limited data regarding real-world effectiveness. Long-term observational controlled studies (LTOCs) extend our understanding by providing longitudinal data across multiple stages of Alzheimer‘s disease (AD). Methods Comparisons of strengths, limitations, evidence level, and results for monotherapy (cholinesterase inhibitors) and combination therapy (cholinesterase inhibitors + memantine) in RCTs versus LTOCs were made. Results Similar to RCTs, LTOCs have shown that both monotherapy and combination therapy are associated with slower cognitive and functional decline. Combination therapy is associated with better cognitive outcomes and greater delays in time to nursing home admission versus monotherapy or no treatment. Persistent antidementia drug treatment is associated with slower decline in cognition, daily function, and global severity, even in patients with advanced disease. Conclusions LTOCs provide complementary evidence regarding effectiveness of antidementia therapy over many years, a time course relevant to AD management. These findings also provide compelling arguments in favor of using LTOCs to estimate effectiveness, risk–benefit, and costs of AD treatments.

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