Diarrhea Management

Definition and Diagnosis

Diarrhea is defined as the abnormal passage of loose or liquid stools more than three times daily and/or stool volume greater than 200g/day for more than 4 weeks, according to the European Society of Gastrointestinal Endoscopy 1
The Bristol Stool Chart can be used to assess consistency, with type 5 and above indicating diarrhea, as recommended by the European Society of Gastrointestinal Endoscopy 1
A systematic diagnostic approach should be followed, including assessment of duration and pattern of symptoms, stool characteristics, and medical history, as suggested by the American Gastroenterological Association 1
Blood tests, including full blood count, C-reactive protein, and electrolytes, can help identify underlying causes of chronic diarrhea, as recommended by the National Institute for Health and Care Excellence 1
Stool tests, such as microscopy, culture, and sensitivity, can help diagnose infectious causes of diarrhea, as suggested by the Centers for Disease Control and Prevention 1
Endoscopic evaluation, including colonoscopy and upper GI endoscopy, may be necessary to diagnose underlying conditions such as inflammatory bowel disease or coeliac disease, as recommended by the American College of Gastroenterology 1

Loperamide is recommended as the first-line antidiarrheal treatment for uncomplicated cases of chronic diarrhea, with a starting dose of 4 mg initially, followed by 2 mg after each loose stool (maximum 16 mg daily), as suggested by the American College of Travel Medicine, the Journal of Travel Medicine, the European Society for Medical Oncology, and the American College of Gastroenterology 2, 3, 1
A bland diet (BRAT: Bananas, Rice, Applesauce, Toast) is recommended while treating with loperamide, and patients should avoid spices, coffee, alcohol, and reduce insoluble fiber intake, as well as consider avoidance of milk and dairy products (except yogurt and firm cheeses), as suggested by the Annals of Oncology and the American College of Gastroenterology 3, 4

For persistent diarrhea, if symptoms persist for more than 24 hours, the dosage of loperamide can be increased to 2 mg every 2 hours, according to the American Society of Clinical Oncology 5
If diarrhea persists beyond 48 hours on loperamide, it is recommended to discontinue loperamide and consider second-line agents, such as subcutaneous octreotide (100-150 μg starting dose), oral budesonide (9 mg daily), or tincture of opium, as suggested by the American Society of Clinical Oncology 5
Oral budesonide (9 mg daily) is an alternative for diarrhea refractory to loperamide, particularly useful for microscopic colitis or immune-mediated diarrhea, with high first-pass metabolism and minimal systemic effects, as recommended by the Annals of Oncology 3
Antisecretory agents, such as octreotide, may be used to treat complicated diarrhea, including chemotherapy-induced diarrhea, as suggested by the American Society of Clinical Oncology, the European Society for Medical Oncology, and the European Society of Gastrointestinal Endoscopy 3, 6
Bile acid sequestrants, such as cholestyramine, may be effective in treating bile acid malabsorption, as recommended by the American Gastroenterological Association 3

Elderly patients are more susceptible to dehydration, electrolyte imbalances, and malnutrition, and require close monitoring, as recommended by the American Geriatrics Society 3
Cancer patients may experience diarrhea as a side effect of chemotherapy, with 74% of patients over 65 years reporting diarrhea during treatment, as reported by the European Society for Medical Oncology 3
Post-surgical patients may be at risk of bile acid malabsorption, small bowel bacterial overgrowth, or dumping syndrome, and require targeted treatment, as suggested by the European Society of Gastrointestinal Endoscopy 1

It is essential to track the number of stools and consistency, monitor for signs of dehydration and electrolyte imbalances, and watch for symptoms of life-threatening sequelae (fever, dizziness on standing), as recommended by the American Society of Clinical Oncology 5
Regular monitoring of stool frequency, consistency, and patient symptoms is essential for adjusting treatment and preventing complications, as recommended by the American Gastroenterological Association 1
Loperamide treatment should be continued until diarrhea resolves for at least 12 hours, and stool frequency and consistency should be tracked during treatment, with review and consideration of alternative causes if diarrhea persists beyond 48 hours of loperamide treatment, as suggested by the World Health Organization and the American College of Gastroenterology 5, 3

Loperamide is contraindicated in patients with dysentery (bloody diarrhea), high fever, or severe abdominal pain, and should be used with caution in elderly patients taking medications that can prolong QT interval, as recommended by the Infectious Diseases Society of America and the American Geriatrics Society 2, 3
The strength of evidence for loperamide treatment in certain patient populations is based on moderate-quality evidence, as reported by the European Society for Medical Oncology 5

Severe dehydration, electrolyte disturbances, significant weight loss, bloody diarrhea, fever, and severe abdominal pain are indications for urgent medical attention, as recommended by the National Institute for Health and Care Excellence 6
Chemotherapy-induced diarrhea with signs of enterocolitis requires prompt treatment, as suggested by the European Society for Medical Oncology 6