Role of Nonsteroidal Anti-Inflammatory Drugs as a Protective Factor in Alzheimer's Disease: A Systematic Review and Meta-Analysis.

Alzheimer's disease (AD) is a major neurodegenerative disease, affecting more than two-third cases of dementia in the world. Nonsteroidal anti-inflammatory drugs (NSAIDs) are widely used anti-inflammatory analgesic agents, representing 7.7% of worldwide prescriptions, of which 90% are in patients over 65 years old. Based on mixed findings by different randomized clinical trials (RCTs), a systematic review and meta-analysis were conducted to develop a better understanding of the protective role of NSAIDs in AD. Database search was Pubmed, WebScience, and Embase. RCTs investigating the effect of NSAIDs on AD or test scores assessing cognitive function in people without AD at baseline were included. Two indicators were the Mini-Mental State Examination (MMSE) Score and Hazard Ratio. 09 studies were included in the present Meta-analysis. For the MMSE score difference, the pooled effect size was - 0.06 (-0.22, 0.10) which was not statistically significant (P value = 0.47). For the MMSE score, the pooled effect size was - 0.0036(-0.0320, 0.0248), which was also not statistically significant (P value = 0.87). For Hazard Ratio (HR), the pooled HR calculated using the random effect model was 1.20 (95% CI: 0.95, 1.51), which was not statistically significant (P value = 0.15). Present meta-analysis shows that NSAIDs, in general, are not effective in the treatment of AD. They also have no protective effect against the development of AD on their sustained use.