Taking statins doesn’t seem to make memory or thinking skills better or worse for people who already have dementia.

What we've found so far is that statin therapy does not appear to significantly affect cognitive function in people who already have dementia, as measured by ADAS-cog scores. Our analysis of the available research suggests no clear improvement or decline in memory or thinking skills linked to statin use in this group [1]. We reviewed 33.0 studies or assertions that looked at whether statins change cognitive outcomes in people with dementia. All 33.0 support the idea that statins do not meaningfully alter cognitive function in these individuals [1]. No studies in our analysis showed that statins made thinking skills worse or better in this population. This means the evidence we’ve reviewed leans toward no noticeable effect of statins on cognition once dementia is already present. It’s important to note that our current analysis focuses only on people who have already been diagnosed with dementia. We are not looking at whether statins might help prevent dementia or slow its onset. We’re only examining what happens to cognitive scores like ADAS-cog when someone with dementia continues or starts statin therapy. The scores measure things like memory, language, and reasoning—key areas affected by dementia. While the evidence we’ve reviewed consistently points in one direction, we recognize that science evolves. Our understanding is based on what has been studied and reported so far, and future research could add new insights. Practical takeaway: If you or a loved one has dementia and is taking a statin for heart health, the evidence we’ve reviewed doesn’t suggest it’s helping or harming memory or thinking skills. Decisions about statin use should still be made with a healthcare provider, based on overall health needs.