Among nutritional supplements, magnesium is one of the most popular. Magnesium health benefits may include better blood sugar management, stronger bones, and better sleep, among other perks. But because it is involved in so many bodily systems and processes, you do need to be careful if you’re taking prescription medications. For instance, can you take magnesium with blood pressure medication?
Meet the experts: Kevin Kheder, M.D., an interventional cardiologist at Hoag’s Jeffrey M. Carlton Heart & Vascular Institute in Newport Beach, CA; Cheng-Han Chen, M.D., an interventional cardiologist and medical director of the Structural Heart Program at MemorialCare Saddleback Medical Center in Laguna Hills, CA.
Here, cardiologists explain how blood pressure medications work to control this heart disease risk factor, plus how magnesium may affect blood pressure levels and the relationship between the two.
How do blood pressure medications work?
There are a few different types of blood pressure medications, and they each work in different ways, explains Kevin Kheder, M.D., an interventional cardiologist at Hoag’s Jeffrey M. Carlton Heart & Vascular Institute in Newport Beach, CA. “Some relax blood vessels, making it easier for blood to flow,” he says. These are the angiotensin-converting enzyme inhibitors, or ACE inhibitors, per the American Heart Association (AHA). “Others help the body eliminate excess sodium and water, reducing blood volume,” says Dr. Kheder. These are the diuretics, or water pills. “Some slow the heart rate or block hormones that cause blood vessels to tighten,” Dr. Kheder says. These are the beta-blockers.
There are also other classes of blood pressure meds, according to the AHA. They include angiotensin II receptor blockers, calcium channel blockers, alpha blockers, alpha-2 receptor agonists, and vasodilators. Ultimately, though, with any drug you’re prescribed, “the goal is to reduce the workload on the heart and lower the risk of heart attack, stroke, kidney disease, and heart failure,” Dr. Kheder explains.
How does magnesium affect blood pressure?
“Magnesium can have a mild blood pressure-lowering effect, especially in people who are deficient,” says Cheng-Han Chen, M.D., an interventional cardiologist and medical director of the Structural Heart Program at MemorialCare Saddleback Medical Center in Laguna Hills, CA. A 2025 review in Hypertension confirmed this, finding that magnesium may be beneficial for lowering blood pressure in people with high blood pressure and magnesium deficiency, thanks to the way it helps relax and widen blood vessels. Still, more large studies are needed.
“Magnesium is generally not a substitute for prescribed medication,” adds Dr. Kheder.
Can you take magnesium with blood pressure meds?
So, if magnesium may help lower blood pressure on its own, what happens if you take it in conjunction with prescribed blood pressure medications? “When combined with blood pressure medications, magnesium may enhance those effects and occasionally cause levels to drop too low,” Dr. Chen explains. Per the Mayo Clinic, low blood pressure can cause symptoms like dizziness or fainting and can be dangerous if it’s happening on a regular basis.
Some magnesium supplements may also interfere with the absorption of certain medications, notes Dr. Kheder. According to the National Institutes of Health (NIH), magnesium may reduce the absorption of antibiotics, osteoporosis medications, and thyroid medications. Considering that hypertension commonly coexists with many other chronic illnesses, if you’re taking meds for another condition this may be important to consider.
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Because magnesium may amplify the effects of blood pressure medication as opposed to hindering its absorption, simply taking them at different times of day may be enough to limit these side effects. “It’s often reasonable to separate magnesium supplements and medications by a few hours, but patients should follow the advice of their healthcare provider or pharmacist,” Dr. Kheder says.
Who should not take magnesium with blood pressure medication?
While separating your magnesium supplement and your blood pressure medication by at least a few hours may be sufficient, there are certain people who should be extra cautious when considering magnesium supplementation while on blood pressure meds. Per Dr. Chen and Dr. Kheder, these include:
- People taking medications that can increase magnesium levels
- People with significant kidney disease
- People taking multiple medications for high blood pressure
- People taking medications that affect kidney function
The bottom line
Magnesium supplements may have a mild blood pressure-lowering effect, especially if you’re deficient in the mineral. So regardless of the type of blood pressure medication you are taking, taking the two together may cause blood pressure to drop too low and lead to symptoms like dizziness. Taking them at different times of day may help you avoid this effect, but it’s important to talk to your doctor about any supplements you are considering to learn how they will personally affect you and your prescribed medications.
Dietary supplements are products intended to supplement the diet. They are not medicines and are not intended to treat, diagnose, mitigate, prevent, or cure diseases. Be cautious about taking dietary supplements if you are pregnant or nursing. Also, be careful about giving supplements to a child, unless recommended by their healthcare provider.
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