Gastrointestinal Disorders

Causes and Associated Symptoms

• Irritable Bowel Syndrome (IBS) often presents with abdominal pain, altered bowel habits, and associated nausea, according to the American Gastroenterological Association 1
• Dumping syndrome, particularly in patients with a history of bariatric surgery, can cause nausea after eating, as reported by the National Institute of Diabetes and Digestive and Kidney Diseases 2
• Small intestinal bacterial overgrowth (SIBO) can cause bloating, diarrhea, and nausea after eating, as stated by the American Gastroenterological Association 2

Dietary Modifications

• Eating smaller, more frequent meals (4-6 per day) can help alleviate post-defecation nausea, as recommended by the Academy of Nutrition and Dietetics 2
• Separating liquids from solids and avoiding drinking 15 minutes before and 30 minutes after meals can help reduce nausea, as suggested by the Academy of Nutrition and Dietetics 2
• Avoiding carbonated beverages can help alleviate nausea, as recommended by the Academy of Nutrition and Dietetics 2
• Following a balanced diet with appropriate fiber intake can help manage IBS-related symptoms, according to the American Gastroenterological Association 1
• Considering a FODMAP diet can help alleviate cramping, diarrhea, and bloating in patients with IBS, as recommended by the American College of Gastroenterology 2 and the American Heart Association 3

Medications

• Metoclopramide (5-20 mg three to four times daily) can act as both prokinetic and antiemetic for nausea, as recommended by the American College of Cardiology 3 and the National Comprehensive Cancer Network 4, 5
• Ondansetron (4-8 mg every 4-8 hours) can be used for persistent nausea, as recommended by the American College of Cardiology 3 and the National Comprehensive Cancer Network 5
• Polyethylene glycol (17g in 8oz water daily) can help manage constipation contributing to nausea, as recommended by the National Comprehensive Cancer Network 6
• Loperamide (4mg initially, then 2mg after each loose stool) can help manage diarrhea contributing to nausea, as recommended by the National Comprehensive Cancer Network 6 and the American Gastroenterological Association 1
• The following medications are recommended for nausea and vomiting:

Lifestyle Modifications

• Maintaining adequate hydration can help alleviate nausea, as recommended by the Academy of Nutrition and Dietetics 2
• Regular physical activity can promote normal bowel function, as recommended by the American Heart Association 3
• Establishing consistent meal and defecation times can help regulate bowel movements, as suggested by the American Gastroenterological Association 1
• Avoiding straining during bowel movements can help reduce nausea, as recommended by the American Gastroenterological Association 1
• Managing stress through relaxation techniques can help alleviate nausea, as recommended by the American Psychological Association 3
• Ensure adequate electrolyte repletion for patients with vomiting and stomach cramps, as recommended by the National Comprehensive Cancer Network 4
• For patients with mild-moderate dehydration, use oral rehydration with clear fluids in small amounts (1-3 oz) frequently, while severe dehydration or inability to tolerate oral fluids requires IV fluid rehydration with 20-30 mL/kg isotonic crystalloid solution over 1-2 hours 4

Travel-Related Nausea

• Transdermal scopolamine is recommended as the most effective single agent for preventing motion sickness during travel, particularly useful for air turbulence-related motion sickness and neuro-ocular vestibular dysfunction (NOVD), with a strength of evidence rated as high, as suggested by the American College of Travel Medicine 9
• Zolpidem can help manage sleep disruption associated with jet lag by facilitating sleep at the destination time zone, with short-term use only (first 1-3 nights after arrival), and a recommended dosage of 5-10 mg orally, as suggested by the American Academy of Sleep Medicine 10
• Melatonin has been increasingly described for jet lag management, though evidence regarding its role in preventing acute confusional states during or after flights is lacking, with a strength of evidence rated as insufficient, as suggested by the American Academy of Sleep Medicine 10
• Non-pharmacological approaches include proper hydration, avoiding alcohol and caffeine during flights, and using eye shades and ear plugs, with a strength of evidence rated as moderate, as suggested by the American College of Travel Medicine and the American Academy of Sleep Medicine 9, 10
• Elderly travelers and those with cognitive impairment should use these medications with caution due to increased risk of confusion and delirium, as advised by the American College of Travel Medicine 9, 10
• Patients with a history of substance abuse should avoid zolpidem, and combined use of scopolamine and zolpidem may increase risk of anticholinergic side effects and sedation, with a warning rated as high, as suggested by the American Academy of Sleep Medicine 10