Medications to Prevent Alzheimer’s

By Dr. Brandon Colby MD, a physician-expert in the fields of Genomics and Personalized Preventive Medicine.

Alzheimer's disease is the leading cause of dementia worldwide. As life expectancy increases globally, the prevalence of this condition continues to rise. Estimates suggest Alzheimer's and dementia affect more than 50 million people today, with projections indicating that number could exceed 150 million by 2050.

There is currently no cure for Alzheimer's disease. However, certain medications already in use for other conditions have demonstrated protective effects, and research into new treatments continues actively through clinical trials. This article covers what is currently known about medications that may help prevent Alzheimer's disease.

Always consult your physician before starting or discontinuing any medication.

NSAIDs

Non-steroidal anti-inflammatory drugs (NSAIDs) are among the most commonly used medications in the world. Common NSAIDs include aspirin, ibuprofen, naproxen, ketoprofen, diclofenac, and celecoxib.

Research has found that long-term daily NSAID use may reduce the risk of Alzheimer's, particularly in people carrying one or two copies of the APOE4 allele, the primary genetic risk factor for Alzheimer's. The protective mechanism is believed to involve both anti-inflammatory properties and disruption of the process that leads to amyloid plaque accumulation between brain cells.

NSAIDs appear most effective before Alzheimer's symptoms set in. They are less effective once the disease has progressed. Side effects including stomach ulcers and blood clotting abnormalities are possible with regular use. Genetic testing can determine whether you carry APOE4, helping clarify whether NSAID-based prevention strategies may be relevant for you.

Statins

Statins are commonly used to manage high cholesterol and triglycerides. Medications in this class include pravastatin, atorvastatin, simvastatin, and lovastatin.

Research has found that statins may also inhibit the formation of amyloid plaques and tau protein tangles in the brain. High cholesterol levels can accelerate beta-amyloid accumulation in the space between neurons, and statins help slow this process by reducing cholesterol. Statins also appear to reduce vascular inflammation and brain ischemia.

Some studies have noted that excessively reducing cholesterol with statins could impair cognitive function, since HDL cholesterol is an important component of brain health. The role of statins in Alzheimer's prevention requires individual assessment with a physician.

Memantine

Memantine is the only medication currently approved by the FDA to treat severe Alzheimer's disease (commercial name: Namenda). It works by regulating glutamate, a neurotransmitter whose dysfunction contributes to brain cell death in Alzheimer's patients.

Emerging research suggests memantine may also help prevent the disease if started before symptoms appear. This is an area of active investigation. Genetic testing for Alzheimer's risk can identify individuals who may benefit from earlier intervention.

Cholinesterase Inhibitors

Cholinesterase inhibitors are the most commonly prescribed medications for mild to moderate Alzheimer's disease. They do not prevent the disease itself but slow its progression and help manage behavioral symptoms. FDA-approved options include donepezil (Aricept), galantamine (Razadyne), rivastigmine (Exelon), and the combination drug Namzaric (donepezil plus memantine).

These medications work by preventing the breakdown of acetylcholine, a neurotransmitter essential to cognitive function. Additional medications may be prescribed to manage psychiatric symptoms such as depression or psychosis.

Emerging Treatments

Clinical trials continue to investigate new treatments for Alzheimer's disease. Aducanumab, a monoclonal anti-amyloid antibody developed by Biogen, has been studied for its ability to reduce amyloid plaques and tau burden. Research into somatostatin, a peptide that can help break down amyloid plaques, is also underway, though still in pre-clinical stages.

References

1. Alzheimer's Disease: Facts and Figures. BrightFocus Foundation. 2019.
2. Colby MD, B. Outsmart Your Genes. 2010.
3. Imbimbo BP, et al. Are NSAIDs useful to treat Alzheimer's disease or mild cognitive impairment? Front Aging Neurosci. 2010.
4. Do Statins Increase or Decrease Alzheimer's Risk? BrightFocus Foundation.
5. How Is Alzheimer's Disease Treated? NIH National Institute on Aging.
6. Alzheimer's disease: Does memantine help? IQWiG. 2017.
7. The FDA Is Reviewing Biogen's Breakthrough Alzheimer's Treatment. WBUR. 2020.
8. New method shows great potential for the treatment of Alzheimer's disease. Uppsala University. ScienceDaily. 2020.

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