Other Information: Each Tablet Contains: Sodium 567 mg. Store at room temperature. Avoid excessive heat. Alka-Seltzer in water contains principally the antacid sodium citrate and the analgesic sodium acetylsalicylate. Misc: Anhydrous Citric Acid/Antacid. Aspirin (NSAID)/Analgesic. Sodium Bicarbonate/Antacid. Fast Relief of: heartburn; upset stomach; acid indigestion with headache, body aches. Questions or Comments? 1-800-986-0369 (Mon - Fri 9 am - 5 pm EST). Made in Mexico.