<Tr> <Th> Tagline </Th> <Td> "Plop, plop, fizz, fizz" </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.alka-seltzer.com http://www.alka-seltzerplus.com/ </Td> </Tr> <P> Alka - Seltzer is an effervescent antacid and pain reliever first marketed by the Dr. Miles Medicine Company of Elkhart, Indiana, United States . Alka - Seltzer contains three active ingredients: aspirin (acetylsalicylic acid) (ASA), sodium bicarbonate, and anhydrous citric acid . The aspirin is a pain reliever and anti-inflammatory, the sodium bicarbonate is an antacid, and the citric acid reacts with the sodium bicarbonate and water to form effervescence . </P> <P> It was developed by head chemist Maurice Treneer . Alka - Seltzer is marketed for relief of minor aches, pains, inflammation, fever, headache, heartburn, stomachache, indigestion, acid reflux and hangovers, while neutralizing excess stomach acid . It was launched in 1931 . </P>

What is the main ingredient in alka seltzer
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