Alka-Seltzer extra strength antacid effervescent tablets provide fast, relief from heartburn and upset stomach associated with acid indigestion. This effervescent formula quickly dissolves in water, releasing bubbles that go to work quickly neutralizing excess stomach acid. Alka-Seltzer works to gently break up and dissolves away your heartburn symptoms fast so you can get back to what's important to you. Each tablet contains a combination of active ingredients: sodium bicarbonate and citric acid, that work to quickly neutralize excess stomach acid. This extra strength formula is ideal for those who need a little extra help with acid control. It is also a great option for those who prefer an effervescent formula over chewable antacid pills. The effervescent formula of Alka-Seltzer Extra Strength starts neutralizing stomach acid in seconds for fast relief of heartburn, indigestion, upset stomach, and sour stomach associated with excess stomach acid. Alka-Seltzer Extra Strength acid relief tablets are convenient and easy to use, whether you're at home or on the go. Simply drop two effervescent tablets into a glass of water, and drink once dissolved. The bubbly effervescent formula quickly goes to work providing fast, effective relief from the discomfort of heartburn, acid indigestion, and upset stomach. These antacid tablets are unflavoured and have no chalky aftertaste once dissolved.