Magnesium (pharmaceutical preparation)

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Magnesium, as a pharmaceutical preparation, is used to treat conditions including magnesium deficiency and hypomagnesemia, as well as eclampsia.[1]

Usually in lower dosages, magnesium is commonly included in dietary mineral preparations, including many multivitamin preparations.

Types of preparations[edit]

In practice, magnesium is given in a salt form together with any of several anionic compounds serving as counter-ions, such as chloride or sulfate ('sulphate' in British English). Nevertheless, magnesium is generally presumed to be the active component. An exception is the administration of magnesium sulfate in barium chloride poisoning,[2] where sulfate binds to barium to form insoluble barium sulfate.

Magnesium is absorbed orally at about 30% bioavailability from any water soluble salt, such as magnesium chloride or magnesium citrate. The citrate is the least expensive soluble (high bioavailability) oral magnesium salt available in supplements, with 100 mg and 200 mg magnesium typically contained per capsule or tablet.

Magnesium aspartate, chloride, lactate, citrate and glycinate each have bioavailability 4 times greater than the oxide form and are equivalent to each other per amount of magnesium, though not in price.[3][4]

The ligand of choice for large-scale manufacturers of multivitamins and minerals containing magnesium is the magnesium oxide due to its compactness, high magnesium content by weight, low cost, and ease-of-use in manufacturing. However it is insoluble in water. Insoluble magnesium salts such as magnesium oxide or magnesium hydroxide (milk of magnesia) depend on stomach acid for neutralization before they can be absorbed, and thus are relatively poor oral magnesium sources, on average.

Magnesium sulfate (Epsom salts) is soluble in water. It is commonly used as a laxative, owing to to the poor absorption of the sulfate component. In lower doses, they may be used as an oral magnesium source, however.

Intravenous or intramuscular magnesium is generally in the form of magnesium sulfate solution. Intravenous or intramuscular magnesium is completely bioavailable, and effective. It is used in severe hypomagnesemia and eclampsia.

Indications[edit]

Indications and uses for administering magnesium include:

Side effects[edit]

More common side effects from magnesium include upset stomach and diarrhea, and calcium deficiency if calcium levels are already low.[9]

Overdose[edit]

Further information: Hypermagnesemia

Overdose of magnesium (hypermagnesemia) is only possible in special circumstances. It can cause nausea, vomiting, severely lowered blood pressure, confusion, slowed heart rate, respiratory paralysis.[9] In very severe cases, it can cause coma, cardiac arrhythmia, cardiac arrest and death.[9]

Magnesium overdose can be counteracted by administering calcium gluconate.[10]

References[edit]

  1. ^ a b c d Euser, A. G.; Cipolla, M. J. (2009). "Magnesium Sulfate for the Treatment of Eclampsia: A Brief Review". Stroke 40 (4): 1169–1175. doi:10.1161/STROKEAHA.108.527788. PMC 2663594. PMID 19211496.  edit
  2. ^ "BARIUM CHLORIDE DIHYDRATE 4. First Aid Measures". Jtbaker.com. Retrieved 2009-07-06. 
  3. ^ Firoz M, Graber M: "Bioavailability of US commercial magnesium preparations.", Magnesium Research 2001 Dec;14(4):257-62.
  4. ^ Lindberg JS, Zobitz MM, Poindexter JR, Pak CY: "Magnesium bioavailability from magnesium citrate and magnesium oxide.",J Am Coll Nutr. 1990 Feb;9(1):48-55.
  5. ^ "When clicking citation, it is listed under ''Other medicinal and home uses''". Disabled-world.com. 2007-01-04. Retrieved 2009-07-06. 
  6. ^ a b Blitz M, Blitz S, Hughes R, Diner B, Beasley R, Knopp J, Rowe BH. Aerosolized magnesium sulfate for acute asthma: a systematic review. Chest 2005;128:337-44. PMID 16002955.
  7. ^ "Magnesium sulfate for preterm labor". Webmd.com. 2007-01-19. Retrieved 2009-07-06. 
  8. ^ Lewis DF (September 2005). "Magnesium sulfate: the first-line tocolytic". Obstet. Gynecol. Clin. North Am. 32 (3): 485–500. doi:10.1016/j.ogc.2005.03.002. PMID 16125045. 
  9. ^ a b c Magnesium at University of Maryland Medical Center (UMMC). Reviewed last on: 6/17/2011 by Steven D. Ehrlich
  10. ^ Omu AE, Al-Harmi J, Vedi HL, Mlechkova L, Sayed AF, Al-Ragum NS (2008). "Magnesium sulphate therapy in women with pre-eclampsia and eclampsia in Kuwait". Med Princ Pract 17 (3): 227–32. doi:10.1159/000117797. PMID 18408392.