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However, too much magnesium from nonfood sources, such as magnesium salts, has been shown to cause mild to severe toxicity. Symptoms can range from diarrhea, nausea and abdominal cramps to difficulty breathing, extremely low blood pressure and irregular heartbeat.
A calcium carbonate with magnesium overdose results from taking too many antacids with these ingredients. Calcium carbonate with magnesium is found in such products as Rolaids, Tums, Mylanta, and Maalox, notes the National Institutes of Health. Symptoms of a calcium carbonate with magnesium overdose include: Bone pain from chronic overuse.