My mom is taking the medicine called gleevec for gastrointestinal stromal tumors. This is the second time around with the drug. The first time she had her tumor removed and it stayed away with the gleevec for five years. A few little tumors came back, (if they ever were completely gone) a few months ago and she's taking it again with a major side effect of diarrhea. Is there anything she can take safely that could help her side effect?