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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.
Alka-Seltzer is an effervescent antacid and pain reliever first marketed by the Dr. Miles Medicine Company of Elkhart, Indiana. It was developed by head chemist Maurice Treneer. Alka-Seltzer is marketed for relief of minor aches, pains, inflammation, fever, headache, heartburn, stomachache, indigestion, and hangovers, while neutralizing excess stomach acid. It was launched in 1931. A spin-off of Alka-Seltzer made to relieve colds and flu, Alka-Seltzer Plus, was later introduced.