Alka-Seltzer Effervescent Antacid & Pain Relief Tablets

That familiar fizz has answered the same two problems for generations: an upset stomach paired with a nagging headache, or the morning-after combination of acid indigestion and body aches. Alka-Seltzer works by dissolving in water first, so the buffered aspirin and sodium bicarbonate go to work already in solution — which is why many people find it gentler on the stomach than swallowing a dry tablet, and why it acts on both heartburn and pain at once.

This collection carries the classic Original Flavor effervescent tablets, including the Alka-Seltzer Antacid that combines anhydrous citric acid, aspirin, and sodium bicarbonate for acid indigestion with headache, and the Alka-Seltzer Effervescent Tablets with Aspirin and buffered aspirin Pain Reliever formulas for headache, minor aches, and pain accompanied by upset stomach.

Buyers usually ask what sets these apart from a plain antacid. The answer is the aspirin: these formulas relieve pain and reduce fever alongside neutralizing stomach acid, making them a two-in-one choice rather than a single-symptom remedy. Because they contain aspirin, they're intended for adults and are not appropriate for children or teens recovering from flu or chickenpox, and anyone watching sodium intake should note the sodium bicarbonate content.

Original Flavor remains the standard for a reason — a fast-dissolving tablet, a consistent effervescent dose, and a taste people already recognize. Facilities, pharmacies, and households alike stock it as a dependable over-the-counter staple for the everyday overlap of stomach and pain discomfort.

Looking for related over-the-counter options? Explore our broader Antacids selection and our Pain Relief collection to compare formats and formulations.