Aspirin Aluminium hydroxide

In vitro data show that magnesium oxide and aluminium hydroxide strongly adsorb aspirin and sodium salicylate. However, in three of the studies above aluminium hydroxide-containing antacids had no effect on the extent of absorption of salicylate, although the rate of absorption may be increased as a result of an increase in the solubility of salicylate in a less acidic gastric environment. ... 

Several drugs contain aluminium hydroxide, especially antacids used to treat gastric acidity. The treatment of certain gastric disorders may lead to the ingestion of more than 1000 mg aluminium hydroxide per day. A buffered aspirin tablet contains between 10 and 20 mg of aluminium hydroxide. 

An aluminium/magnesium hydroxide antacid (Maalox) and AlkaSelt-zer (aspirin, calcium phosphate, citric acid and sodium bicarbonate) do not significantly affect the absorption of cefixime, ... 

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