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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.
After reading your reply, I started him on the sweet potato, which seems to have had a very positive effect. He has now gone for 24 hours without diarrhea. I also purchased the probiotic water kefir that you mentioned, and he is starting that too (in teaspoon doses at mealtimes, per the instructions on the bottle).