Simply, this one is tough on heartburn. As soon as you feel the first signs of heartburn or acid indigestion, Alka-Seltzer Heartburn's effervescent lemon-lime formula starts working immediately neutralizing acid on contact. Alka-Seltzer Heartburn does not contain aspirin. It goes to work on contact.

Directions: Do not take more than 5 chewable tablets in a 24-hour period. Adults and Children 12 Years and Over: Chew and swallow 1-2 chewable tablets every 2 to 4 hours as symptoms occur, or as directed by a doctor. Children Under 12 Years: Consult a doctor.

Ingredients Active Ingredients: In Each Chewable Tablet: Calcium Carbonate (750 mg). Purpose: Antacid. Inactive Ingredients: Acacia, Beeswax, Carmine, Carnauba Wax, Citric Acid, Corn Starch, Corn Syrup, DL-Alpha Tocopherol, FD&C Blue 1 Aluminum Lake, FD&C Red 40 Aluminum Lake, FD&C Yellow 5 Lake (Tartrazine), FD&C Yellow 6, FD&C Yellow 6 Aluminum Lake, FD&C Yellow 6 Lake, Flavors, Hydrogenated Coconut Oil, Medium Chain Triglycerides, Methyl Paraben, Modified Starch, Phosphoric Acid, Pregelatinized Modified Starch, Propyl Paraben, Propylene Glycol, Purified Water, Shellac, Sodium Benzoate, Sorbic Acid, Sorbitol, Soy Lecithin, Sucrose, Titanium Dioxide.