Paper II
2025 August (Supplementary) (2010 Scheme)

Question

Magnesium hydroxide and Aluminium hydroxide combination as antacid

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Answer

Magnesium hydroxide and aluminium hydroxide are combined because their individual adverse effects on bowel habit are opposite and mutually offsetting: magnesium hydroxide tends to cause diarrhea (poorly absorbed Mg²⁺ osmotically draws water into the gut lumen), while aluminium hydroxide tends to cause constipation (reduces GI motility). Combining them balances bowel habit while both contribute acid-neutralizing capacity, giving a better-tolerated antacid than either agent used alone at an equivalent neutralizing dose.

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