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Caption: Alka-Seltzer. View of an Alka-Seltzer tablet effervescing as it dissolves in water. Alka- Seltzer is a non-prescription proprietary antacid. Each tablet contains sodium bicarbonate, citric acid and aspirin. The sodium bicarbonate is present as a fast-acting acid-neutralising compound. The citric acid is used to promote effervescence of the tablets in solution, and to prevent 'acid rebound' (over-production of stomach acids following the dose of bicarbonate). Aspirin is included as a mild pain reliever, its speed of action is promoted by the carbon dioxide generated by the reaction of the bicarbonate with stomach acids and the tablet's citric acid.

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Keywords: alimentary, alka-seltz, alka-seltzer, antacid, aspirin, canal, circle circles, digestive tract, drug, effervescence, effervescing, fizzing, healthcare, heartburn, indigestion, medical, medicine, motion action, move movement moving, over the counter, over-the-counter, pharmaceutic, pharmaceutical, pill, round shape, rounded circular, sodium bicarbonate, treatment

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