Magnesium hydroxide

Chemical formula: Hâ‚‚MgOâ‚‚  Molecular mass: 58.32 g/mol  PubChem compound: 73981

Active ingredient description

Magnesium hydroxide is practically insoluble in water and solution is not effected until the hydroxide reacts with hydrochloric acid in the stomach to form magnesium chloride. Its neutralising action is almost equal to that of sodium bicarbonate. When the dose is in excess of that required to neutralise the acid the intragastric pH may reach pH 8 or 9. Acid rebound following magnesium hydroxide is clinically insignificant. Magnesium hydroxide has an indirect cathartic effect resulting from water retention in the intestinal lumen.

Medicine classification

This medicinal substance has been classified in the anatomical therapeutic chemical (ATC) classification according to its main therapeutic use as follows:

ATC code Group title Classification
A02AA04 Magnesium hydroxide A Alimentary tract and metabolism → A02 Drugs for acid related disorders → A02A Antacids → A02AA Magnesium compounds
Discover more medicines within A02AA04
G04BX01 Magnesium hydroxide G Genito urinary system and sex hormones → G04 Urologicals → G04B Other urologicals, incl. antispasmodics → G04BX Other urologicals
Discover more medicines within G04BX01

Product monographs

Competent medicine agencies globally have authorized commercialization of this active ingredient according to these medication package inserts (MPIs):

Title Information Source Document Type  
MILK OF MAGNESIA Oral Suspension Medicines & Healthcare Products Regulatory Agency (GB) MPI, EU: SmPC

Structural formula

Graphic representation of the active ingredient's molecular structure

External identifiers

CAS Substance: 1309-42-8
DrugBank Drug: DB09104
PubChem Compound: 73981
RxNorm Ingredient: 6581
SNOMED-CT Concept: 387337001
Magnesium hydroxide (substance)
UNII Identifier: NBZ3QY004S
MAGNESIUM HYDROXIDE

Medicines

Magnesium hydroxide is an active ingredient of these brands:

Austria (AT)

Brazil (BR)

Canada (CA)

Croatia (HR)

Cyprus (CY)

Ecuador (EC)

Estonia (EE)

Finland (FI)

France (FR)

Hong Kong (HK)

Ireland (IE)

Israel (IL)

Japan (JP)

Lithuania (LT)

Malta (MT)

Mexico (MX)

Netherlands (NL)

New Zealand (NZ)

Nigeria (NG)

Poland (PL)

Romania (RO)

Singapore (SG)

South Africa (ZA)

Tunisia (TN)

Turkey (TR)

United Kingdom (UK)

Note the following: The list of brand names is continuously updated, and thus does not include the total of products circulating worldwide.

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