My girl is ten on phenobarbital,for seizures and for the four months get attacks of diarreha. Had all tests, X-ray of abdomen , blood work. All 500 dollars of them!! At first they said giardia, gave Meds, a white liquid Panacor I think....she ok for a couple weeks..then severe diarreha again took,her back in. Gave Mertrondizole, ok for a while. Now terrible diarreha again...she now steps in it !!!!! In zero weather with 12 in of snow!!!!