From the manufacturer's website:
Get fast relief of heartburn, sour stomach, acid indigestion with headache or body aches with this effervescent antacid and pain reliever that has been around for more than 80 years. Unlike other antacids, Alka-Seltzer® Original contains aspirin for pain accompanying heartburn and acid indigestion. It’s also great for pain alone.
Warning: See attached picture.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.