Treatment of Diarrhoea in Children
Oral rehydration solution (ORS) is the cornerstone of diarrhoea treatment in children, combined with zinc supplementation at a reduced dose of 5 mg daily for up to 14 days in children up to 10 years of age, while continuing normal feeding and avoiding antibiotics unless bloody diarrhoea is present.
Core Treatment Algorithm
1. Immediate Rehydration Strategy
Start ORS at home as soon as diarrhoea begins 1. The key to successful oral rehydration, especially when vomiting is present, is administering small volumes (5-10 mL) every 1-2 minutes via spoon, syringe, or cup—gradually increasing the amount 1. A common pitfall is allowing thirsty children to drink large volumes ad libitum, which triggers vomiting and perceived treatment failure.
- For mild-moderate dehydration: ORS is effective in >90% of children with vomiting when given properly 1
- For severe dehydration/shock: Start with IV fluids initially, then transition to ORS 1
- If persistent vomiting: Consider nasogastric tube with continuous slow infusion of ORS 1
2. Zinc Supplementation
Give 5 mg zinc daily for 14 days to all children aged 6 months to 10 years with acute watery or persistent diarrhoea 2. This represents a critical update from the previous 20 mg dose.
The evidence strongly supports this reduced dose:
- Lower doses (5-10 mg) are non-inferior to 20 mg for reducing diarrhoea duration and stool frequency 3
- Vomiting risk is significantly reduced: 13.7% with 5 mg vs 19.3% with 20 mg 3
- In children ≥6 months, zinc shortens diarrhoea duration by approximately 11-13 hours 4, 5
- In malnourished children, the effect is greater—reducing duration by approximately 26 hours 4
Important caveat: Do not use zinc in children <6 months of age—evidence shows no benefit and possible harm in this age group 4.
3. Nutritional Management
Continue normal feeding throughout the illness 1. Early refeeding reduces intestinal permeability, decreases illness duration, and improves nutritional outcomes 6.
- Infants: Offer more frequent breastfeeding or bottle feeding 1
- Older children: Continue age-appropriate diet without restriction 1
- Avoid the 24-hour fasting approach—this is not supported by evidence 6
- Consider lactose-free diet if diarrhoea persists, as this may reduce duration by 18 hours 6
4. Antibiotic Indications
Antibiotics are NOT indicated for acute watery diarrhoea 2. The only exception is:
- Bloody diarrhoea (dysentery): Use ciprofloxacin as first-line treatment 1, 2
- These children need immediate medical evaluation as they may have bacterial or parasitic infections requiring antimicrobial therapy 1
5. Adjunctive Medications
Antimotility agents (loperamide) are contraindicated in all children <18 years 6. Deaths have been reported in 0.54% of children given loperamide, particularly those <3 years old 6.
Antiemetics (ondansetron) may be considered in children >4 years with significant vomiting to facilitate oral rehydration 6. However, be aware that ondansetron may increase stool volume 6.
Probiotics are NOT recommended due to low-certainty evidence and feasibility concerns 2.
When Oral Rehydration Fails
Switch to IV therapy if:
- Shock or near-shock state 1
- Intestinal ileus (wait until bowel sounds return) 1
- True glucose malabsorption (rare—diagnosed when stool output dramatically increases with ORS and immediately decreases with IV therapy) 1
- Stool output >10 mL/kg/hour (though most still respond to adequate ORS replacement) 1
Critical Implementation Points
Home management should be emphasized: Families should keep ORS at home at all times, similar to keeping acetaminophen in the medicine cabinet 1. Early home intervention reduces complications, hospitalizations, and deaths 1.
Avoid inappropriate treatments: Do not use antidiarrheal medications, home remedies, or withhold food 1. These common practices worsen outcomes.
The zinc-vomiting relationship: While zinc increases vomiting risk (particularly with the first dose), the 5 mg dose significantly reduces this side effect while maintaining therapeutic efficacy 3, 5. The vomiting is typically transient and does not interfere with overall ORS use 7.