Antacids neutralize stomach acid, though depending on brand and type they differ greatly in their reaction time and neutralizing capacity.
Pepto-Bismol etc. (bismuth subsalicylate) is an antacid and antidiarrheal medication that contains non-aspirin salicylates.
Pepto-Bismol etc. (bismuth subsalicylate) is available in liquid, tablet, and caplet form and is sometimes used by vets to treat dogs with diarrhea or Helicobacter infections.