Question: what is the difference between alka seltzer and alka seltzer xs?
Answer: Alka-Seltzer XS Effervescent Tablets include a stronger formulation than the original Alka-Seltzer. They dissolve in water to give a sparkling solution and contain five active substances: aspirin (acetylsalicylic acid), paracetamol, citric acid, caffeine and sodium hydrogen carbonate.