Management of Prolonged Diarrhea in Children

Rehydration and Initial Assessment

The American Academy of Pediatrics recommends evaluating hydration status first by examining skin turgor, mucous membranes, mental status, pulse, and capillary refill time to determine if rehydration is needed 1
If dehydrated, administer oral rehydration solution (ORS) based on severity: 50 mL/kg for mild (3-5% deficit) or 100 mL/kg for moderate (6-9% deficit) dehydration over 2-4 hours 1
Replace ongoing losses with 10 mL/kg of ORS for each watery stool and 2 mL/kg for each vomiting episode 1
If severe dehydration is present (≥10% deficit, altered mental status, shock), immediately administer 20 mL/kg IV boluses of lactated Ringer's or normal saline until pulse, perfusion, and mental status normalize 1, 2

The Centers for Disease Control and Prevention recommends considering obtaining stool cultures and microscopy when watery diarrhea has persisted for 5 weeks, as antibiotics should be considered when watery diarrhea lasts greater than 5 days 3, 4
Look specifically for bacterial pathogens (Salmonella, Shigella, Campylobacter), parasites (Giardia), or other treatable organisms 2
Assess for warning signs requiring immediate attention: bloody diarrhea (dysentery), high fever, severe dehydration, or high stool output (>10 mL/kg/hour) 1

The American Academy of Pediatrics recommends continuing the standard polymeric formula (Pediasure) at full strength immediately, as children previously receiving lactose-containing formulas can tolerate the same product in most instances, and diluted formula does not confer any benefit 2
Do NOT switch to lactose-free or soy formula unless true lactose intolerance is confirmed by clinical worsening (more severe diarrhea) upon formula reintroduction 3, 4
Resume age-appropriate normal diet immediately, offering food every 3-4 hours alongside the formula 2
Recommended foods include starches, cereals, yogurt, fruits, and vegetables 1, 3, 4
Avoid foods high in simple sugars and fats 1, 3, 4

The American Academy of Pediatrics recommends against using antimotility drugs (loperamide) as they are absolutely contraindicated in all children under 18 years of age 1
Zinc supplementation may reduce diarrhea duration, though this is primarily beneficial in children with malnutrition or those in zinc-deficient regions 1, 5
Probiotic preparations may be offered to reduce symptom severity and duration 1, 5
Ondansetron may be considered if vomiting is present and the child is adequately hydrated, though it should only be used in children >4 years of age 1

The Centers for Disease Control and Prevention recommends initiating empiric antibiotic therapy given the 5-week duration of diarrhea, as this exceeds the 5-day threshold for considering antimicrobial treatment 1, 3, 4
Antibiotics are specifically indicated when watery diarrhea persists for more than 5 days, when dysentery or high fever is present, or when stool cultures identify a treatable pathogen 1, 3, 4
The choice of antibiotic should be guided by local resistance patterns and stool culture results when available 2

Reassess hydration status after 2-4 hours of rehydration therapy 1
Instruct caregivers to return immediately if the child develops decreased urine output, lethargy, irritability, intractable vomiting, or worsening condition 1, 4, 5