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How does managing your blood pressure reduce your risk of dementia?

Ruslan Dorfman, PhD, MBA4 Nov 2026

High blood pressure (hypertension) is one of the most important risk factors for dementia that you can change. Damage to the brain’s blood vessels, from strokes, small silent strokes and changes in the brain’s white matter, can lead to vascular dementia and can also make other forms of dementia, such as Alzheimer’s disease, worse. Managing blood pressure, cholesterol and stroke risk often takes several medications, including blood pressure medications, statins and blood thinners. This article explains what research shows about blood pressure and dementia, and how pharmacogenetic testing can help make these medications safer.

How is blood pressure linked to dementia?

Vascular dementia is caused by reduced blood flow to the brain, often after a stroke or many small strokes. About 5% to 10% of people with dementia have vascular dementia alone, but it is more common as part of mixed dementia, together with Alzheimer’s disease. Damage to small blood vessels in the brain is common with age and is linked to memory and thinking problems.

The 2024 Lancet Commission on dementia identified 14 risk factors that can be changed, including high blood pressure, high LDL cholesterol, diabetes, smoking, physical inactivity and hearing loss. It estimated that addressing these factors could prevent or delay a large share of dementia cases, and recommended treating high blood pressure, aiming for a systolic pressure (the top number) of 130 mm Hg or less from about age 40.

What did the ARIC study find about blood pressure over time?

The Atherosclerosis Risk in Communities (ARIC) study followed 4,761 people for 24 years, from midlife (ages 44 to 66) to later life (ages 66 to 90), and compared their blood pressure patterns with their risk of dementia:

People who had high blood pressure (above 140/90 mm Hg) in midlife had a 41% higher risk of dementia later in life, whatever their blood pressure was later on.
People with high blood pressure in both midlife and later life had a 49% higher risk than people whose blood pressure stayed normal.
People who had high blood pressure in midlife and then low blood pressure (below 90/60 mm Hg) in later life had a 62% higher risk, the highest of all groups.

This suggests that the damage linked to dementia may begin in midlife, decades before symptoms appear. It also suggests that blood pressure that falls too low in later life, after years of hypertension, may reduce blood flow to the brain. Good blood pressure control in midlife, and careful review of blood pressure medications as you age, are both important.

Does lowering blood pressure prevent dementia?

In the SPRINT MIND trial, 9,361 adults aged 50 or older with high blood pressure were assigned to a systolic target below 120 mm Hg or below 140 mm Hg. The lower target significantly reduced mild cognitive impairment (by about 19%) and the combination of mild cognitive impairment or dementia (by about 15%). The reduction in dementia alone was not statistically significant, partly because the trial was stopped early for its heart benefits.

Lifestyle also helps. In the Finnish FINGER trial, a two-year program of healthy diet, exercise, brain training and monitoring of heart risk factors helped protect thinking skills in older adults at risk of dementia. Your doctor will set a blood pressure target that suits your age and health, and you may need both lifestyle changes and medication to reach it.

Why does starting treatment earlier matter?

The damage to blood vessels that leads to dementia builds up over decades, and the ARIC study shows that high blood pressure in midlife matters most. Starting blood pressure medications and statins earlier in life, when they are needed, extends their protective effect over more years and may do more to protect the brain than starting treatment late. The 2024 Lancet Commission recommends treating high blood pressure and high LDL cholesterol from midlife, from about age 40. Knowing your pharmacogenetic results before you start these long-term medications helps your doctor choose the right drug and dose from the beginning. Read more about pharmacogenetics for dementia prevention and longevity.

How does preventing stroke help?

Stroke is a major cause of vascular dementia. Two common situations call for blood thinners:

Atrial fibrillation, an irregular heartbeat, increases the risk of stroke. Anticoagulants such as apixaban, rivaroxaban or warfarin lower this risk. The warfarin dose is affected by the CYP2C9 and VKORC1 genes. Read more about warfarin, food and genes.
After a minor stroke or transient ischemic attack (TIA), an antiplatelet medication such as clopidogrel is often used to prevent another stroke. Clopidogrel must be activated by the CYP2C19 enzyme. In the CHANCE-2 trial of people with a minor stroke or TIA who carried a reduced-function CYP2C19 variant, 6.0% of those treated with ticagrelor had another stroke within 90 days, compared with 7.6% of those treated with clopidogrel. CPIC recommends considering an alternative to clopidogrel for CYP2C19 poor and intermediate metabolizers after a stroke or TIA.

How do genes affect blood pressure medications and statins?

Blood pressure medications that lower pressure too much can cause dizziness and falls, which are especially dangerous for older adults. Some heart medications are affected by genes. For example, metoprolol, a beta-blocker, is broken down by CYP2D6. CYP2D6 poor metabolizers have higher drug levels and a slower heart rate, so CPIC advises starting at a low dose and increasing it gradually. Read more about medications that can cause falls in older adults.

Statins lower LDL cholesterol and the risk of heart attack and stroke. In a French study of more than 120,000 people aged 75, stopping a statin was linked to a 33% higher risk of hospital admission for a heart or blood vessel event. Whether statins also directly prevent dementia is still uncertain.

Muscle aches are a common reason people stop statins, but in large blinded trials, more than 90% of muscle symptoms in people taking statins were not caused by the statin. Serious muscle damage is rare. Genes can still matter: the 2022 CPIC guideline uses three genes to guide statin choice and dose:

SLCO1B1, a transporter that carries statins into the liver. People with decreased or poor function have higher statin levels and a higher risk of muscle symptoms, especially with simvastatin. CPIC recommends a lower dose or a different statin, not stopping statins altogether.
ABCG2, which affects rosuvastatin levels.
CYP2C9, which affects fluvastatin.

Interactions also matter: medications such as clarithromycin can raise the levels of some statins. Read more about whether statins are safe for you.

Medications for erectile dysfunction may also play a role. Sildenafil, tadalafil and vardenafil (PDE5 inhibitors) relax blood vessels and improve blood flow. In a UK study of more than 269,000 men with erectile dysfunction, those who started one of these medications had an 18% lower risk of Alzheimer’s disease, and the risk was lower still in men who filled more prescriptions. This was an observational study, so a clinical trial is needed to confirm the benefit. These medications must never be combined with nitrates, such as nitroglycerin, because together they can cause a dangerous drop in blood pressure. Read more about managing erectile dysfunction when you take heart medications.

How can a Pillcheck test help?

If you are in midlife or older and have high blood pressure, high cholesterol, a past stroke or TIA, or a family history of dementia, a pharmacogenetic test can help your doctor choose safer doses and medications. A Pillcheck test reports CYP2C19, CYP2C9, VKORC1, CYP2D6, SLCO1B1, ABCG2 and other genes that affect blood thinners, statins, heart medications, pain medications and antidepressants. A pharmacist reviews your results together with all your medications. Because your DNA does not change, your results can guide prescribing for the rest of your life. Read more about how Pillcheck helps optimize medications for seniors with dementia.

Pillcheck testing is performed in CAP- and COLA-accredited clinical genetic laboratories located in Canada. Pillcheck reports on 24 genes, increasing coverage with new guidelines and drug labels (see the genes tab), and covers 355 medications, which account for over 70% of dispensed prescriptions. The Pillcheck test panel ensures high accuracy for people of non-European and admixed ancestries. Your results last a lifetime, and report updates are free of charge.

Summary

High blood pressure in midlife is linked to a higher risk of dementia later in life, and the 2024 Lancet Commission lists it among 14 modifiable risk factors.
Blood pressure that drops too low in later life, after years of hypertension, may also raise the risk.
Starting blood pressure medications and statins earlier, from midlife when needed, extends their protective effect.
In SPRINT MIND, a lower systolic target reduced mild cognitive impairment; the effect on dementia alone was not statistically significant.
Preventing stroke, with anticoagulants for atrial fibrillation and antiplatelets after a stroke or TIA, protects the brain.
CYP2C19 affects clopidogrel, CYP2C9 and VKORC1 affect warfarin, CYP2D6 affects metoprolol, and SLCO1B1, ABCG2 and CYP2C9 guide statin choice and dose.

Frequently asked questions

Can controlling blood pressure prevent dementia?

It can lower the risk. Studies link high blood pressure in midlife to dementia later in life, and in the SPRINT MIND trial a lower blood pressure target reduced mild cognitive impairment. No single treatment is guaranteed to prevent dementia.

Can blood pressure be too low for older adults?

Yes. Blood pressure that falls too low, especially in people who had high blood pressure for many years, can reduce blood flow to the brain and cause dizziness and falls. Ask your doctor to review your medications regularly as you age.

Do statins prevent dementia?

Statins lower the risk of heart attack and stroke. Whether they directly prevent dementia is still uncertain, but preventing stroke helps protect the brain.

Which genes affect stroke prevention medications?

CYP2C19 affects how well clopidogrel works, and CYP2C9 and VKORC1 affect the warfarin dose. Newer anticoagulants such as apixaban and rivaroxaban are not affected by these genes.