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An article from Sixty and Me highlights NIH and FDA guidance that long-term use of some proton pump inhibitors and diuretics can lower magnesium. The guidance supports discussing medicine history and whether testing is appropriate with a health professional; it does not mean everyone taking these medicines has a deficiency.
A Sixty and Me report is urging people who take some long-term heartburn or diuretic medicines to ask a health professional whether their magnesium should be reviewed. The concern is supported by information from the National Institutes of Health (NIH) and the U.S. Food and Drug Administration (FDA): certain proton pump inhibitors and diuretics can affect magnesium, though the risk for any individual depends on their health and medicines.
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 a long time—typically more than a year—can cause low magnesium. The FDA advises doctors to consider checking magnesium before long-term PPI treatment and periodically afterward.
The source report says that in the FDA cases it reviewed, magnesium supplements often raised low levels, but did not do so in about one-quarter of reported cases; those patients had to stop the PPI. That figure describes the cases reviewed, not the likelihood that a particular person taking a PPI will develop low magnesium. People using an over-the-counter PPI every day are advised by the report to tell their clinician how long they have taken it.
Some loop diuretics, such as furosemide, and thiazide diuretics, such as hydrochlorothiazide, can increase magnesium loss in urine with long-term use. Potassium-sparing diuretics, including spironolactone, have a different effect and reduce magnesium loss, according to the NIH information summarized in the report. Patients should not stop or change a prescribed medicine without discussing it with their prescriber.
Medication Reviews Can Catch Magnesium Risks
Magnesium helps support normal nerve and muscle function, and severe deficiency can affect heart rhythm. The NIH lists possible early symptoms such as loss of appetite, nausea, fatigue and weakness; more serious deficiency may involve tingling, cramps, seizures, personality changes or an abnormal heart rhythm. These symptoms can have many causes, so they do not establish that someone has low magnesium.
The issue may be easy to miss in a routine review. Magnesium is not necessarily included in standard electrolyte testing, and the report notes that less than 1% of the body’s magnesium is in blood. A blood test is commonly used and can identify a low result, but the NIH says no single test is considered fully satisfactory. A clinician may consider the result alongside a person’s symptoms, medical history and medicines.
The practical value of the report is a prompt to check a medication list rather than assume a symptom is due to age or start a supplement independently. Older adults are among the groups the NIH identifies as at risk, and medicine use and chronic conditions can affect magnesium levels. That is a reason to raise the question, not evidence that every older adult taking these drugs needs testing.
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Which Medicines Are Involved
The report distinguishes between medicine classes rather than treating all heartburn or blood-pressure medicines alike. PPIs lower stomach acid and are used for reflux and ulcers. Diuretics increase urination, but their effects on magnesium vary by type: loop and thiazide diuretics may increase losses, while potassium-sparing diuretics can reduce them.
Age can also affect magnesium balance. The NIH says older adults may consume less magnesium, absorb less through the gut and lose more through the kidneys. In otherwise healthy people, a low-magnesium diet by itself seldom causes symptoms because the kidneys conserve magnesium when intake is low. Long-term low intake, some health conditions, heavy alcohol use and certain medicines can contribute to deficiency.
Food sources listed by the NIH include pumpkin seeds, almonds, cooked spinach and black beans. The report gives a recommended daily amount of 320 milligrams for women over 50. Food figures and individual needs vary; the source does not suggest that diet alone replaces clinical assessment when a deficiency or medicine effect is suspected.
“Doctors should consider checking magnesium before starting long-term PPI treatment and periodically after that.”
— U.S. Food and Drug Administration guidance, as summarized by the NIH Office of Dietary Supplements
Individual Risk Depends on the Full Picture
The source does not provide a new study, estimate of how many people taking these medicines develop deficiency, or a publication date. The FDA case figure cited for PPI users is drawn from reported cases reviewed by the agency; it cannot be used to calculate an individual’s risk or the frequency of the problem among all users.
It is also not possible to tell from symptoms alone whether magnesium is low. Fatigue, weakness and cramps have many potential explanations, and a normal blood result does not necessarily describe the body’s total magnesium stores. Whether testing is appropriate, and how results should be interpreted, depends on a person’s medicines, medical conditions and clinical assessment.
The report does not say that patients should stop PPIs or diuretics. It specifically advises continuing prescribed medicines until discussing them with a clinician. It also cautions that magnesium supplements can be risky for people with kidney disease because impaired kidneys may not clear excess magnesium effectively.
Bring a Complete Medicine List
The report recommends writing down all prescription and over-the-counter medicines, including how long each has been used, and taking the list to a doctor or pharmacist. Patients can ask whether any medicine affects magnesium and whether a test is suitable for them. A clinician can review the full medication list and decide whether testing or another check is warranted.
People should ask before starting a magnesium supplement, particularly if they have kidney disease, and should not change a prescribed treatment on their own. If a person has a seizure or a racing or irregular heartbeat, the report says to seek medical care right away. The source offers no new testing timetable beyond the FDA guidance it cites; decisions remain individualized.
Key Questions
Which heartburn medicines are linked to low magnesium?
The report identifies proton pump inhibitors, including omeprazole, esomeprazole, lansoprazole and pantoprazole. NIH information cited in the report says prescription use over a long period, typically more than a year, can cause low magnesium. Ask a clinician about daily over-the-counter use as well.
Can water pills affect magnesium?
Some can. The report says loop and thiazide diuretics may increase magnesium loss in urine over time. Potassium-sparing diuretics, such as spironolactone, are described as reducing magnesium loss. Do not stop a prescribed diuretic without speaking with its prescriber.
Does a routine blood test check magnesium?
Not always. The source says magnesium is not necessarily part of routine electrolyte testing. A blood magnesium test is commonly used, but results may need to be considered alongside symptoms, health history and medicines.
Should I start taking magnesium supplements?
Ask a health professional before starting a supplement. The source specifically warns that kidney disease can make excess magnesium harder to clear. A clinician can help decide whether testing, dietary changes or another step is appropriate.
Source: sixtyandme.com
