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Can taking just one Sulfatrim DS tablet to prevent a urinary tract infection before the removal of a catheter cause side effects like diarrhea?

It is unlikely that taking one tablet of Sulfatrim DS to prevent a urinary tract infection before the removal of a catheter will cause side effects like diarrhea. While diarrhea can occur as a side effect of antibiotics impacting the intestinal flora, taking only one tablet is less likely to have a significant effect on the flora. Therefore, there should be no need to worry about experiencing side effects from taking a single tablet.