Post-Surgery Constipation: Prevention and Relief Strategies

Why It Happens

• Opioid analgesics (mu-receptor agonism → reduced gut motility)
• Anesthesia (ileus)
• Reduced mobility, oral intake, fluid intake
• Pre-op bowel prep (if any)
• Stress, unfamiliar environment

Proactive Prevention (Start Pre-Op If Possible)

1. Fiber Ramp-Up: 25–35 g/day from whole foods (fruits, vegetables, legumes, whole grains, nuts, seeds). Add psyllium husk (1 tsp in 8 oz water) if diet insufficient.
2. Hydration: 2–3 L/day (water, herbal tea, broth, diluted juice). Avoid excess caffeine/alcohol.
3. Early Mobilization: Ambulate per surgeon's orders (often POD 0 or 1). Walking stimulates peristalsis.
4. Opioid-Sparing Pain Plan: Scheduled acetaminophen + NSAID (if allowed) + regional block + non-pharmacologic (ice, positioning, TENS). Minimize opioids.
5. Prophylactic Laxatives (High Evidence): Docusate + Senna (or polyethylene glycol/PEG 3350 17 g daily) starting POD 0 or 1 — unless contraindicated (obstruction, peritonitis).

Treatment If Constipated (No BM by POD 2–3)

1. Osmotic Laxative: PEG 3350 17 g in 8 oz water 1–2×/day (first-line, safe, non-habit forming).
2. Stimulant: Senna 17.2 mg (2 tabs) at bedtime; add bisacodyl 10 mg suppository if no result in 24h.
3. Enema: Sodium phosphate (Fleet) or tap water — if no BM 3+ days, no contraindication.
4. Rescue: Magnesium citrate 150–300 mL (if renal function normal).
5. Newer Agents (if chronic): Lubiprostone, linaclotide, plecanatide, prucalopride — per GI consult.

Red Flags — Seek Immediate Care

• No flatus + abdominal distension + vomiting → possible ileus/obstruction.
• Severe pain, fever, hematochezia.
• Post-op day 5+ with no BM despite interventions.

Medication Review

Common constipating drugs: opioids, anticholinergics, calcium channel blockers, iron, ondansetron, diuretics, antacids (Al/Ca). Ask pharmacist/team to minimize.

Bowel recovery is a quality metric. Speak up early — your team expects it.