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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.
Magnesium side effects Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using magnesium gluconate and call your doctor at once if you have any of these serious side effects: 1  nausea or vomiting; 2  fast or slow heart rate; 3  feeling light-headed, fainting; or. 4  warmth, tingling, or redness under your skin.