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Have you been having any nausea or vomiting? Are the stools soft and loose, or just water?
Stomach flu (viral) and food poisoning (bacterial) typically take 3-5 days to resolve. After the 3rd or 4th day, the diarrhea typically slows down a bit and becomes less watery. If this is happening, there is a good chance you have turned the corner. Imodium should only be used if you are feeling better and are having more than 2 or 3 loose stools daily. Be sure to stay well hydrated, as dehydration is the greatest risk. If your symptoms do not get slowly better with each passing day, you should see a doctor to make sure you do not have a more serious infection that might require antibiotics and/or intravenous hydration.