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Painkiller Mefenamic Acid: Completely Reversed Mice Memory Loss

Mefenamic Acid, a commonly used anti-inflammatory drug, successfully treated Alzheimer’s in the lab.
The University of Manchester showed how this medication completely reversed memory loss and brain inflammation in mice.

NSAIDs & Alzheimer’s

Nearly everybody will at some point in their lives take non-steroidal anti-inflammatory drugs; mefenamic acid, a common Non-Steroidal Anti Inflammatory Drug (NSAID), is routinely used for period pain. In research using mice, it completely reversed memory loss and brain inflammation.

The findings are published in a paper authored by Dr David Brough and colleagues, in the respected journal Nature Communications. Dr Brough and Dr Catherine Lawrence supervised PhD student Mike Daniels, and postdoc Dr Jack Rivers-Auty who conducted most of the experiments.

Inflammatory Pathway

Though this is the first time a drug has been shown to target this inflammatory pathway, highlighting its importance in the disease model, Dr Brough cautions that more research is needed to identify its impact on humans, and the long-term implications of its use.

The research, funded by the Medical Research Council and the Alzheimer’s Society, paves the way for human trials which the team hope to conduct in the future.

Around 500,000 people in the UK have Alzheimer’s disease which gets worse over time, affecting many aspects of their lives, including the ability to remember, think and make decisions.

Mefenamic Acid Vs. Placebo

In the study transgenic mice that develop symptoms of Alzheimer’s disease were used. One group of 10 mice was treated with mefenamic acid, and 10 mice were treated in the same way with a placebo.

The mice were treated at a time when they had developed memory problems and the drug was given to them by a mini-pump implanted under the skin for one month.

Memory loss was completely reversed back to the levels seen in mice without the disease.

Stopping Brain Cell Damage

Dr Brough said: “There is experimental evidence now to strongly suggest that inflammation in the brain makes Alzheimer’s disease worse.

“Our research shows for the first time that mefenamic acid, a simple Non-Steroidal Anti Inflammatory Drug can target an important inflammatory pathway called the NLRP3 inflammasome , which damages brain cells.”

He added: “Until now, no drug has been available to target this pathway, so we are very excited by this result.

“However, much more work needs to be done until we can say with certainty that it will tackle the disease in humans as mouse models don’t always faithfully replicate the human disease.

Available Drug, Faster to Trial

“Because this drug is already available and the toxicity and pharmacokinetics of the drug is known, the time for it to reach patients should, in theory, be shorter than if we were developing completely new drugs.

“We are now preparing applications to perform early phase II trials to determine a proof-of-concept that the molecules have an effect on neuroinflammation in humans.”

Dr Doug Brown, Director of Research and Development at Alzheimer’s Society, said: “Testing drugs already in use for other conditions is a priority for Alzheimer’s Society – it could allow us to shortcut the fifteen years or so needed to develop a new dementia drug from scratch.

“These promising lab results identify a class of existing drugs that have potential to treat Alzheimer’s disease by blocking a particular part of the immune response.  However, these drugs are not without side effects and should not be taken for Alzheimer’s disease at this stage – studies in people are needed first.”

Full bibliographic information:

  • Fenamate NSAIDs inhibit the NLRP3 inflammasome and 2 protect against Alzheimer’s disease in rodent models, published in the journal Nature Communications

    Michael J. D. Daniels, Jack Rivers-Auty, Tom Schilling, Nicholas G. Spencer, William Watremez, Victoria Fasolino, Sophie J. Booth, Claire S. White, Alex G. Baldwin, Sally Freeman, Raymond Wong, Clare Latta, Shi Yu, Joshua Jackson,
    Nicolas Fischer, Violette Koziel, Thierry Pillot, James Bagnall, Stuart M. Allan, Pawel Paszek, James Galea, Michael K. Harte, Claudia Eder, Catherine B. Lawrence, David Brough*


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May 4, 2020 11:34 am

Since the prognosis is grim if we have dementia/ Alzheimer’s, why can’t us who have the disease already volunteer to be on the trial now in hopes it does help as thought. Instead of staying home and watching our own life fade away?

Dementia patient X
Dementia patient X
August 1, 2021 8:41 am

I tried mefenamic acid 500 mg twice a day for an year, it does reverse the cognitive impairment significantly, but not without the price of side effect such as peptic ulcers, gastric perforation, mouth ulcers and decrease in immunity. Now I decrease the use of mefenamic acid 500 mg twice a day to 2-6 (take it for two months and stop for six months), the effect wasn't as great as the former treatment.

B. Berger

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