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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
There are multiple advantages to using Alka-Seltzer effervescent products. In short: the medicine dissolves fast and goes to work instantly, neutralizing acid on contact. Because the medicines in Alka-Seltzer effervescents are in solution prior to ingestion, they do not require time to dissolve in the stomach like similar active ingredients taken in a tablet form.