Alka-Seltzer

Alka-Seltzer is a brand of effervescent over-the-counter medications used mainly for relief of heartburn, acid indigestion, sour stomach, and related symptoms.

Alka-Seltzer is an effervescent over-the-counter brand owned by Bayer, used mainly for heartburn and acid indigestion. It dissolves in water and some versions also contain aspirin for pain relief.

What it is

Alka-Seltzer is a brand of effervescent tablets that fizz when dropped in water. The original product, first marketed in 1931 in the United States, contains aspirin, sodium bicarbonate, and anhydrous citric acid. Different formulations exist, with some focusing on antacid relief and others adding pain or cold-and-flu ingredients.

Key details

The effervescent action comes from citric acid and sodium bicarbonate. Original, Extra Strength, and Lemon-Lime versions include aspirin, so they are not suitable for people who should avoid NSAIDs. For heartburn, adults and children 12 and over typically take 2 tablets every 4 hours, up to 8 tablets in 24 hours. Always check the label for your specific product.

Why it matters

Alka-Seltzer is a common household remedy in Canada, sold over the counter at pharmacies and retailers. Because formulations vary, Canadian users should read local dosing directions carefully. Aspirin-containing versions carry risks like stomach bleeding or allergic reactions, so it's important to choose the right product for your symptoms.