Because of the potential for side effects and interactions with medications, dietary supplements should be taken only under the supervision of a knowledgeable healthcare provider. Individuals with heart or kidney disease should not take magnesium supplements except under the guidance of a qualified healthcare practitioner. It is extremely rare to overdose on magnesium from food alone. However, people who consume excessive amounts of milk of magnesia (as a laxative or antacid) or Epsom salts (as a laxative or tonic) may overdose on this mineral, especially if they have kidney problems. Too much magnesium can cause serious health problems including nausea, vomiting, severely lowered blood pressure, slowed heart rate, deficiencies of other minerals, confusion, coma, and even death. More common side effects from magnesium include upset stomach and diarrhea. Magnesium competes with calcium for absorption and can cause a calcium deficiency if calcium intake levels are already low. From the University of Maryland Medical Center website: http://www.umm.edu/altmed/articles/magnesium-000313.htm
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It gets excreted by your kidneys since they are very effective in eliminating excess magnesium from your blood, however, patients with renal failure or impaired kidney function can suffer from an overdose of magnesium, where its symptoms include:
* Weakness * Nausea & Vomiting * Hypotension, which later on can lead to shock * Irregular breathing * Arrhythmia & Asystole, since it causes conduction delays in the heart, being a calcium channel blocker
Higher concentrations of magnesium in the blood can eventually lead to a complete heart block and later on a cardiac arrest.
High level of magnesium or hypermagnesemia can result if you overdose on magnesium. This usually results in nausea, vomiting, abnormal heart rhythms, low blood pressure, lack of muscle rigidity and reflexes.
It depends how much you eat but for sure, you may burp and fart a bit. then later have some sort of fever. Then pain in the gut and some anxiety of thinking off death (Maybe a mental thing). If you eat to much could lead to an overdose of magnesium, however depends how the amount you have in the blood though.
I eat a 2 gram piece, so experience of it.