magnesium hydroxide n a slightly alkaline crystalline compound Mg(OH)2 that is obtained by hydration of magnesia or by precipitation (as from seawater by lime in the production of magnesium chloride) as a white nearly insoluble powder and is used chiefly in medicine as an antacid and laxative see MILK OF MAGNESIA
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a magnesium salt used as an osmotic laxative. It is also combined with other drugs in antacid preparations.
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[USP] Mg(OH)2, an oral antacid and laxative, also used as a preventative for hypomagnesemia.Medical dictionary. 2011.