Upset stomach, indigestion, sour stomach, heartburn, acid reflux, diarrhea and constipation can hit at any time and make anyone miserable. Be prepared to take care of yourself or your loved ones with feel-better, over-the-counter stomach remedies. Shop our large assortment which includes antacid tablets, anti-diarrheal medicine, Milk of Magnesia, stool softeners, fiber caplets and more.