Hypermagnesemia: Identifying magnesium excess and its associated health hazards
Julia Wójcik
2026-05-19
2 min. read
Hypermagnesemia: Identifying magnesium excess and its associated health hazards
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The condition in which serum magnesium levels exceed physiological norms is clinically defined as hypermagnesemia. Although toxicity from this mineral occurs infrequently, its excess can precipitate severe metabolic disruptions, neurological impairments, and, in extreme cases, pose a life-threatening risk. Consequently, magnesium supplementation—whether administered orally or parenterally—must be approached with meticulous caution, strictly adhering to the manufacturer’s guidelines or following prior consultation with a physician or clinical nutritionist.
Magnesium overdose
Magnesium plays an important role in our bodies. It is responsible for many physiological and biochemical processes, so overdose of this element has serious consequences for the functioning of the body. Magnesium excess occurs when its concentration in the blood is above 1.5 mmol/l. The ability to maintain concentrations at appropriate levels, or so-called homeostasis, depends primarily on the balance between absorption by the body and the kidneys.
Magnesium overdose is a symptom
A serum magnesium concentration above 1.5 mmol/l usually shows no symptoms. It is only when the level of this element increases and occurs in the serum at a concentration of about 2 3 mmol /l that certain symptoms begin to appear. Hypermagnesia is most commonly characterized by excessive sleepiness, dizziness, constipation, breathing disorders, arrhythmia and low blood pressure. Very often there are also nausea, vomiting and darkness within the face.
Magnesium overdose is an effect
The effects of an overdose of magnesium are very dangerous to human health. There are problems with the heart, muscles, breathing and stomach. Such a chronic condition can lead to the development of low blood pressure, weakening of muscle strength or bradycardia. Excess of this element can even lead to drowsiness.