Alka-Seltzer Lemon Lime Heartburn Relief Effervescent tablets start neutralizing excess stomach acid in seconds. Drop 2 tablets in water and drink to neutralize 99% of stomach acid for fast acid indigestion relief. Alka-Seltzer Lemon Lime Heartburn Relief tablets are convenient and portable, so relief is always within reach. Each antacid tablet contains the active ingredients Anhydrous citric acid and Sodium bicarbonate. To use, fully dissolve tablets in 4 ounces of water before taking Adults and children 12 years and over can take 2 tablets every 4 hours as needed, or as directed by a doctor. Do not take more than 8 tablets in 24 hours.
