Alka-Seltzer is an effervescent, dissolvable tablet combining aspirin (NSAID) and antacids (sodium bicarbonate, citric acid) to provide fast relief for heartburn, acid indigestion, sour stomach, and accompanying pain or headaches. It works by neutralizing stomach acid and reducing pain. Alka-Seltzer is typically taken as 2 tablets dissolved in water every 4 hours.
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