Magnesium is normally cleared by the kidneys, so people with reduced kidney function or kidney failure can be at greater risk of magnesium accumulating in the blood. Very high levels can cause weakness, low blood pressure, breathing problems, abnormal heart rhythms, and in severe cases cardiac arrest.
The other group is people taking medications that interact with magnesium, particularly certain antibiotics and oral osteoporosis medicines (bisphosphonates). Magnesium can reduce their absorption if taken too close together. Some diuretics and long-term acid-reducing medicines can also affect magnesium levels.
A safer headline would be:
“Taking Magnesium? 2 Groups Who Should Check With a Doctor First”
Or:
“Magnesium Supplements Aren’t Safe for Everyone: 2 Groups Who Need Extra Caution”
The warning applies primarily to supplemental magnesium and magnesium-containing medicines, not ordinary magnesium obtained from food.
