Other Information: Each tablet contains: sodium (588 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. Made in Germany.