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How long do the effects last? In mild cases, diarrhea may last up to 14 days after you stop taking the antibiotic. If you have a more severe case, the symptoms may not go away until several weeks after you begin treatment. Sometimes the symptoms return in spite of treatment.
The sooner antibiotic-associated diarrhea is diagnosed, the better, so always contact your doctor if you notice a change in bowel habits within six weeks of taking a course of antibiotics. Antibiotics do not help with the common cold or the flu, which are both viral infections.