The Catholic University of America

I have diarrhea.

Follow the same plan for nausea and vomiting above. You can try over the counter anti-diarrheal medicines, such as Imodium or Pepto-Bismol. Follow the directions on the label. After your symptoms resolve, avoid fatty foods or foods that may be hard to digest. Call Student Health Services if you have persistent diarrhea or abdominal pain and cramping, bloody stools, high fever, or extreme weakness.