Diarrhea treatment
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Diarrhea - Treatment
Definition & Classification
- Acute diarrhea: sudden onset, lasts < 14 days (most commonly infectious)
- Persistent/Chronic diarrhea: > 14 days (different etiologies and management)
Acute diarrhea is defined as an abrupt onset of abnormally high fluid content in stool with increased volume or frequency. Globally it causes ~1.6 million deaths/year, with the highest burden in children under 5 in low-income countries. - Rosen's Emergency Medicine, p. 3245
Goals of Treatment
Treatment is directed at three things:
- Preventing or treating dehydration
- Replacing ongoing fluid losses
- Meeting nutritional needs
1. Oral Rehydration Therapy (ORT) - CORNERSTONE
ORT is first-line for all patients with mild to moderate dehydration. It works via sodium-glucose cotransport at intestinal brush border cells, which remains intact even in severe diarrhea - Tintinalli's Emergency Medicine, p. 888
WHO Reduced-Osmolarity ORS (2002):
| Component | Amount |
|---|---|
| Glucose | 75 mmol/L |
| Sodium | 75 mmol/L |
| Potassium | 20 mmol/L |
| Chloride | 65 mmol/L |
| Base (bicarbonate) | 10 mmol/L |
| Osmolarity | 245 mOsm/L |
Practical volumes:
- Mild dehydration: 30-50 mL/kg over 4 hours
- Moderate dehydration: 60-80 mL/kg over 4 hours
- Replace ongoing losses: 10 mL/kg per diarrheal stool, 2 mL/kg per vomiting episode
Important: Sports drinks, juice, tea, and soda are NOT adequate rehydration fluids - they are deficient in sodium and have excessive sugar that can worsen fluid losses. - Tintinalli's, p. 888
In children with mild gastroenteritis and minimal dehydration in high-income settings: dilute apple juice followed by preferred fluids is an acceptable alternative, with fewer treatment failures compared to standard electrolyte solutions.
2. IV Rehydration - When ORT Fails
IV rehydration (0.9% saline or isotonic crystalloid) is reserved for:
- Severe dehydration / hemodynamic compromise
- Altered mental status precluding safe oral intake
- Failure of ORT trial after 4-8 hours in the ED
- Inability to tolerate oral fluids
Severe dehydration protocol: 20 mL/kg IV bolus of isotonic saline - repeat until clinical improvement. Volume requirements > 60 mL/kg without improvement should raise concern for septic shock, hemorrhage, or adrenal insufficiency. - Rosen's Emergency Medicine, p. 3245
A Cochrane review confirmed ORT is equivalent to IV therapy for rehydration outcomes, and is associated with a shorter hospital stay. Only 1 in 25 children treated with ORT will fail and require IV fluids.
3. Diet & Feeding
- Early refeeding is recommended - routine fasting is NOT recommended during infectious diarrhea
- Resume age-appropriate diet as soon as the patient can tolerate it
- The BRAT diet (bananas, rice, applesauce, toast) has no strong evidence base; a balanced diet is preferred
4. Zinc Supplementation
- Children: Zinc sulfate 20 mg/day for 10-14 days is recommended as an adjunct to rehydration (especially in low-income settings)
- Reduces duration and severity of diarrhea
- Recommended by WHO for children with acute diarrhea
- Should also be considered in cholera and shigellosis treatment - Goldman-Cecil Medicine; Red Book 2021
5. Antibiotics - Targeted Use Only
Antibiotics are NOT recommended for:
- Viral gastroenteritis (norovirus, rotavirus) - no pharmacologic treatment is effective
- Most uncomplicated bacterial gastroenteritis in healthy patients
- Uncomplicated acute watery diarrhea without travel history
Antibiotics ARE recommended for:
| Organism | Drug of Choice |
|---|---|
| Clostridioides difficile | Vancomycin (oral) or fidaxomicin; metronidazole for mild cases |
| Giardia intestinalis | Metronidazole or tinidazole |
| Entamoeba histolytica | Metronidazole + luminal agent (paromomycin) |
| Shigella (dysentery) | Azithromycin or fluoroquinolone (guided by susceptibility) |
| Salmonella (severe/bacteremia) | Fluoroquinolone or ceftriaxone |
| Campylobacter (severe) | Azithromycin |
| Vibrio cholerae | Doxycycline or azithromycin |
| Traveler's diarrhea | Azithromycin or rifaximin |
Anti-motility agents (loperamide): Avoid in dysentery (bloody diarrhea) and in confirmed/suspected Shiga toxin-producing E. coli O157:H7 - may prolong exposure to toxin and worsen outcomes. They may be used for watery non-inflammatory diarrhea in adults. - Goldman-Cecil Medicine
6. Anti-motility & Symptomatic Agents
| Drug | Use |
|---|---|
| Loperamide | Watery diarrhea in adults; avoid in dysentery and HUS risk |
| Bismuth subsalicylate | Traveler's diarrhea; mild symptoms |
| Racecadotril (enkephalinase inhibitor) | Being studied but not routinely recommended for rotavirus/norovirus |
| Ondansetron | For vomiting to facilitate ORT (particularly in children > 4 years) |
7. When to Seek/Escalate Care
Consider hospitalization or further workup if:
- Signs of severe dehydration (sunken eyes, skin pinch returns slowly, altered consciousness)
- Bloody or mucoid stools (dysentery)
- Fever > 38.5°C
- Diarrhea > 10 stools/day
- Diarrhea persisting > 14 days
- Immunocompromised patient, infant < 3 months, or elderly
- Failed oral rehydration trial over 4-8 hours
8. Special Populations
- Infants < 3 months: Higher risk for serious bacterial infection; low threshold for cultures, blood work, and admission
- Immunocompromised: Broader workup including blood cultures; consider empiric antibiotics
- Pregnancy: Shigellosis may cause preterm labor; antibiotic treatment warranted
- Traveler's diarrhea: Empiric antibiotics more appropriate; azithromycin or rifaximin first-line
9. Prevention
- Rotavirus vaccine has markedly reduced pediatric diarrhea-related ED visits, hospitalizations, and deaths worldwide
- Hand hygiene, safe water, adequate sanitation
- Breastfeeding reduces risk in infants
Sources:
- Tintinalli's Emergency Medicine: A Comprehensive Study, Ch. 131 (p. 888)
- Rosen's Emergency Medicine, Ch. 167 (p. 3245)
- Goldman-Cecil Medicine International Edition, Ch. 278, 285
- Red Book 2021: Report of the Committee on Infectious Diseases
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