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A report based on guidance from the NIH and FDA highlights that long-term use of certain heartburn drugs and diuretics can lower magnesium. It advises patients to review their medicines and ask a clinician whether testing is appropriate; patients should not stop prescribed medication on their own.
A Sixty and Me report is urging people who take certain long-term heartburn medicines or water pills to ask a clinician whether their magnesium levels should be checked. The report draws on guidance from the National Institutes of Health (NIH) and the U.S. Food and Drug Administration (FDA), which identify some proton pump inhibitors and diuretics as medicines that can affect magnesium; it does not establish that every person taking them has a deficiency.
The heartburn medicines at issue are proton pump inhibitors (PPIs), including omeprazole, esomeprazole, lansoprazole and pantoprazole. The NIH Office of Dietary Supplements says prescription PPIs taken for long periods, typically more than a year, can cause low magnesium. It advises patients using an over-the-counter PPI every day to tell their health care provider how long they have used it.
The report says the FDA reviewed cases in which magnesium became low during PPI use. In many reported cases, supplements raised levels, but in about one-quarter of the reviewed cases they did not, and the patient had to stop the PPI. That proportion describes the FDA’s reported cases, not the likelihood that an individual patient will develop low magnesium. The FDA advises clinicians to consider checking magnesium before long-term PPI treatment and periodically afterward.
Some water pills, or diuretics, can also increase magnesium loss in urine with long-term use. The NIH identifies loop diuretics such as furosemide and thiazide diuretics such as hydrochlorothiazide. Potassium-sparing diuretics, including spironolactone, can have the opposite effect and reduce magnesium loss. Patients should not stop or change a prescribed medicine without first speaking with their clinician.
Medication Reviews Can Flag Magnesium Risks
Magnesium supports normal body functions, and low levels can have a range of effects. The NIH lists appetite loss, nausea, vomiting, fatigue and weakness among early signs; more serious deficiency can involve numbness, tingling, muscle cramps, seizures, personality changes or an abnormal heart rhythm. These symptoms are not specific to magnesium deficiency and can have many other causes, so they cannot establish a diagnosis on their own.
The issue is relevant to older adults because the NIH identifies them as a group at risk of low magnesium. Aging can be accompanied by lower dietary intake, reduced absorption and greater urinary loss, while chronic conditions and medicines may also affect levels. A medication review can help patients and clinicians decide whether testing or another step makes sense, without assuming that a commonly used prescription is unsafe for everyone.
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Why Routine Blood Panels May Miss It
The report notes that magnesium is not always included in routine electrolyte testing. The NIH says less than 1% of the body’s magnesium is in blood, with most held in bones and soft tissues; blood levels are tightly regulated and correlate only weakly with total body magnesium. A routine panel may therefore omit the test, and a normal blood result does not necessarily establish that overall stores are full.
That limitation does not make testing useless. The NIH describes a blood magnesium measurement as the most commonly used and readily available assessment, and it is the test the FDA advises clinicians to consider for people taking PPIs long term. The NIH also says no single test is fully satisfactory, so clinicians may weigh a result alongside a person’s symptoms, health conditions and medication history.
The report’s practical suggestion is to bring a complete list of medicines to a clinician or pharmacist, including nonprescription heartburn pills and how long each has been taken. It also recommends asking whether any medicines can affect magnesium and whether a test is appropriate. Magnesium supplements should be discussed with a health professional first, particularly for people with kidney disease, because impaired kidneys may not clear excess magnesium effectively.
“Prescription proton pump inhibitors can cause low magnesium when taken for long periods, typically more than a year.”
— The NIH Office of Dietary Supplements, as summarized in the report
Individual Risk Depends on Health History
The report does not give an individual risk estimate for people taking PPIs or diuretics. The FDA case proportion cited for PPI-related low magnesium is based on reported cases and cannot be applied as a personal probability. The available material also does not specify how often testing should occur for every patient or establish that symptoms such as fatigue or cramps are caused by low magnesium.
Whether testing is suitable depends on factors such as the particular medicine, duration of use, other health conditions and a clinician’s assessment. The report offers no new study or updated FDA action; it summarizes existing guidance. Readers should discuss their own medicines and concerns with a qualified health professional rather than stopping a prescription or starting a supplement based on symptoms alone.
Bring a Medicine List to Your Clinician
People taking these medicines can write down each prescription and over-the-counter product, how long they have used it, and any symptoms they want to discuss. They can ask their clinician or pharmacist whether a medicine may affect magnesium, whether their magnesium has been checked, and whether testing is appropriate. Do not stop a prescribed PPI or diuretic without medical guidance.
Patients can also ask before using a supplement, especially if they have kidney disease. The report points to magnesium-containing foods, including pumpkin seeds, almonds, spinach and black beans, as dietary sources, but it does not suggest that food or supplements replace individualized medical advice. Any next step should reflect the person’s medication plan and health history.
Key Questions
Which heartburn medicines are linked to low magnesium?
Proton pump inhibitors, including omeprazole, esomeprazole, lansoprazole and pantoprazole, can cause low magnesium with long-term use, according to the NIH guidance cited in the report. The guidance says prescription use for more than a year is a typical timeframe; individual risk varies.
Can water pills affect magnesium?
Some loop and thiazide diuretics can increase magnesium loss in urine over time. The NIH examples cited are furosemide and hydrochlorothiazide. Potassium-sparing diuretics such as spironolactone can reduce magnesium loss instead.
Does a normal routine blood test rule out low magnesium?
Not necessarily. Magnesium may not be part of a routine electrolyte panel, and blood levels do not closely reflect all the magnesium stored in the body. A clinician can decide whether a blood test and other information are useful.
Should I stop my medicine or start a supplement?
No. The report advises people to keep taking prescribed medicines until they have spoken with their clinician. Ask a health professional before starting a magnesium supplement, particularly if you have kidney disease.
Source: sixtyandme.com
