You can use Pepto or Pepcid AC (only, not complete).
For Pepto, give 1 teaspoon per 5 lbs. every 6 hours.
For Pepcid AC, give 1/4 of a 10 mg. tablet 2 times daily.
I would us the Pepto for diarrhea/stomach upset and the Pepcid AC for an upset stomach without diarrhea.
Good luck.
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