Constipation Management Chronic in Pediatrics

Sequential and interactive guide for the clinical pediatrician. pediapp.online© 2026

The diagnosis is fundamentally clinical, based on the Rome IV Criteria . A detailed medical history and thorough physical examination (including perineal examination) are the cornerstone.

Red Flags (Urgent Reference)

  • Start < 1 month of age
  • Delay in meconium (>48h)
  • Family history of Enf. by Hirschsprung
  • Bilious vomiting or severe bloating
  • Failure to thrive/malnutrition
  • Anorectal/sacral anomalies
  • Focal neurological deficit

A. Fecal Disimpaction

Mandatory if there is a palpable fecal mass (abdominal or rectal). Always prefer the oral route.

Choice PEG 3350 ± electrolytes
  • Dose: 1 - 1.5 g/kg/day for 3 to 6 days.
  • Goal: Liquid or very soft stools, cleansing the colon.

B. Maintenance Therapy

Goal: a smooth, painless evacuation every day. Start after disimpacting or starting if there is no impaction.

1st Line
PEG 3350
  • Dose: 0.4 - 0.8 g/kg/day.
  • Duration: Minimum 2 months. Slow withdrawal.
Alternative
Lactulose
  • Dose: 1 - 3 ml/kg/day (1-2 doses).
  • Increased risk of meteorism.

C. Studies and Reevaluation

  • Studies: Routine unnecessary without red flags. Abdominal X-ray only if there is clinical doubt of impaction.
  • Re-evaluation: Appointment in 2 to 4 weeks to assess dose adjustment and adherence.

The most common cause of therapeutic failure is poor adhesion or an insufficient dose.

Reevaluate and Reinforce

Adherence Real daily intake?
Dose Was PEG optimized?
Conduct Bathroom routines?
Psychology Does fear/pain persist?

Pharmacological Step

If adhesion is good and PEG is at maximum dose, add a stimulant laxative (intermittent or rescue use).

  • Sodium picosulfate: 2-10 years (2-5 drops/night); >10 years (5-10 drops/night).
  • Sennosides A-B: 2-6 years (2.5-7.5 mg/day); 6-12 years (5-15 mg/day).
  • Bisacodyl: >6 years (5-10 mg/day).

Diagnostic Tests to Consider

TSH/FT4 Anti-tTG IgA (Celiac) Ions / Calcium Rx Abdomen

When to refer to Gastro. Pediatrician?

  • Any red flag.
  • Failure to treat 2nd line with good adhesion.
  • Clinical suspicion of organicity (Hirschsprung, Celiac).
  • Intractable constipation (need for repeated disimpaction).

Specialized Approach

Motility Studies Anorectal manometry (useful to rule out Hirschsprung) and colonic transit.
Anatomical Studies Opaque enema and rectal suction biopsy (Gold Standard Hirschsprung).

Other Specialties

Pediatric Surgery: Confirmed/suspected anatomical anomalies.
Psychology: Severe toilet phobia, dysfunctional family dynamics.

The success of the treatment depends 80% on the hygienic-dietary measures at home.

YES DO

Bath Routine Sit the child for 5-10 minutes, 2-3 times/day after meals (gastrocolic reflex). Use foot stool.
Positive Reinforcement Reward the effort of sitting (stickers), not the amount of stool.
Diet & Water Increase fiber (fruits with skin, vegetables) and plenty of water.

DON'T

Zero Punishments Do not scold for accidents (encopresis). Aggravates retention.
Do not force food If you reject fiber, look for attractive alternatives or supplements.
Discontinue early Do not remove the PEG abruptly even if the child improves quickly.

1. First-line drug for maintenance:

2. Recommended starting dose of PEG 3350 (Maintenance):

Tabbers MM et al. ESPGHAN/NASPGHAN Guidelines (2014) • Hyams JS et al. Rome IV Criteria (2016) • NICE Guidelines CG99 (2010)