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Pharmacologic Classification: Antacids.
Pharmacology: Pharmacodynamic: Aluminum hydroxide is a slow-acting antacid and magnesium hydroxide is fast acting. The 2 are frequently combined in antacid mixtures. Aluminum hydroxide on its own is astringent and may cause constipation. This effect is balanced by the effect of magnesium hydroxide, which, in common with other magnesium salts, may cause diarrhea.
Pharmacokinetic: The absorption of aluminium and magnesium from antacids is small. Aluminum hydroxide is slowly converted to aluminium chloride in the stomach. Some absorption of soluble aluminium salts occur in the gastrointestinal tract with urinary excretion. Any absorbed magnesium is likewise excreted in the urine.
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