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Magnesium Chloride Side Effects

author image Linda Tarr Kent
Linda Tarr Kent is a reporter and editor with more than 20 years experience at Gannett Company Inc., The McClatchy Company, Sound Publishing Inc., Mach Publishing, MomFit The Movement and other companies. Her area of expertise is health and fitness. She is a Bosu fitness and stand-up paddle surfing instructor. Kent holds a bachelor's degree in journalism from Washington State University.
Magnesium Chloride Side Effects
A bundle of Swiss chard on a wooden cutting board. Photo Credit: marmo81/iStock/Getty Images

Your body needs magnesium to function properly, and a lack of this mineral can lead to muscle weakness, irregular heartbeat and irritability, according to the National Institutes of Health Office of Dietary Supplements. You can usually get enough via your diet by eating green leafy vegetables, whole grains, peas and nuts. However, you can also take a magnesium supplement. Magnesium chloride is an inorganic supplement, in contrast to magnesium gluconate or malate, which are organic forms of magnesium, according to the “Handbook of Minerals as Nutritional Supplements” by Robert A. DiSilvestro. Magnesium chloride will raise magnesium levels in your body. You may, however, experience some side effects.

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You may experience diarrhea with magnesium chloride supplements, which usually come in the form of sustained-release tablets, according to This is a common side effect. You should check with your doctor if it persists.

Allergic Reactions

You need to seek medical attention immediately if you suffer an allergic reaction while taking magnesium chloride supplements. Symptoms may include difficulty breathing; a tight feeling in the chest; a rash; hives; itching; or a swollen face, tongue, lips or mouth, according to

Severe Effects

If you notice slow reflexes or nausea due to taking magnesium chloride supplements, you need to gain medical attention, advises Also seek attention if your heartbeat slows, you have double or blurred vision, or you become extremely drowsy. On the other hand, having too much magnesium in your body can affect your nervous system and cause your blood pressure and respiratory rate to fall. A coma, respiratory paralysis or even death can result from extremely high levels of magnesium chloride in your system. The tolerable upper limit intake for adults is 350 milligrams per day.

Drug Interactions

Magnesium can interact with several medications, so talk to your doctor before you start supplementing with it, advises the University of Maryland Medical Center. Be especially careful if you are taking antibiotics, blood pressure medicine, medicine to treat diabetes, digoxin, diuretics, hormone replacement therapy during menopause, levothyroxine, penicillamine or osteoporosis medication.

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