Alka-Seltzer Heartburn Relief extinguishes the fire of your worst heartburn. Its aspirin-free effervescent formula starts to work the instant you take it. For effective relief of acid indigestion and upset stomach with headache or body aches and pains, try Original Alka-Seltzer also available in great tasting lemon-lime. And to break up your worst cold symptoms, try Alka-Seltzer Plus Cold.