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See the DrugPatentWatch profile for lactulose

Lactulose Solution (DailyMed)
(Common brand names: Enulose®, Lactulose, Lactulose Solution – 20 g/100 mL)

1. Mechanism of Action

Effect How it Happens Clinical Impact
Osmotic laxative Lactulose is a synthetic disaccharide (galactose + fructose). It isn’t absorbed in the small intestine; instead it travels to the colon where it is partially fermented by bacteria to short‑chain fatty acids and lactic acid. These acids lower the pH, pulling water into the colon. Softens stool, increases stool frequency, improves bowel movements.
Colon pH modulation The acids produced lower colonic pH to ~5.5–6.0. Reduces ammonia‑producing bacteria and decreases ammonia absorption in hepatic encephalopathy.
Decreases ammonia absorption Lower pH inhibits bacterial urease activity, reducing ammonia production. Helps control neurotoxicity in hepatic encephalopathy.
Alters intestinal motility Water influx and bacterial metabolism stimulate colonic peristalsis. Helps clear constipation and reduce stasis.

Key points to remember

  • Lactulose is not absorbed; its effect is local to the colon.
  • Its fermentation is why a “bloating” or “flatulence” reaction can occur.
  • The osmotic action is the primary driver of the laxative effect; the acidifying effect is especially useful in liver disease.

2. Indications

Condition Typical DailyDose Notes
Functional constipation (adult & pediatric) 15–30 mL (≈3–6 g) PO once daily, titrate up to 45 mL (≈9 g) Start low, increase slowly to avoid diarrhea.
Hepatic encephalopathy (recurrent or chronic) 15 mL PO 4–5 times daily (≈3–5 g each dose); may start at 15 mL every 2–3 hrs if needed Aim for 2–3 bowel movements/day. Monitor ammonia levels and mental status.
Other indications (rare) – Sometimes used in other forms of constipation‑related disorders, but not FDA‑approved for those.

Dosage in children is typically weight‑based, but the 15 mL PO once daily is common for ages 2–6 yrs and 20 mL PO for >6 yrs, adjusting for tolerance.

3. How to Take It

  1. Mix: Stir or shake well before each use; the solution is clear and slightly sweet.
  2. Measure: Use the dosing syringe or measuring cup; avoid over‑pouring.
  3. Timing: Can be taken with or without food.
  4. Hydration: Encourage adequate water intake; lactulose draws water into the colon.
  5. Monitoring: Watch for diarrhea; if it becomes severe, reduce dose or discontinue.
  6. Storage: Store at room temperature (not refrigerated); keep out of reach of children.

4. Common Side Effects

  • Bloating / flatulence (due to bacterial fermentation).
  • Abdominal cramping or pain.
  • Diarrhea (if dose is too high).
  • Electrolyte disturbances (rare, usually with very high doses).

5. Precautions & Contraindications

  • Contraindicated: Severe dehydration, ileus, bowel obstruction.
  • Caution: In renal or hepatic impairment, monitor fluid/electrolytes.
  • Drug interactions: May reduce absorption of other orally‑administered drugs.

6. Quick FAQ

Question Answer
Why does it cause flatulence? Fermentation by colonic bacteria produces gases (CO₂, H₂, CH₄).
Can I take it with antibiotics? Yes, but it might affect the absorption of certain antibiotics (e.g., penicillin) – discuss with your prescriber.
Is it safe for kids? Yes, it's commonly used in pediatric constipation. Start with lower volumes (15 mL) and titrate.
How long before it works? Usually 24–48 hrs for constipation, 12–24 hrs for hepatic encephalopathy.
What if I miss a dose? Take it as soon as you remember; don’t double‑dose.

Bottom line: Lactulose solution is a gentle, osmotic laxative that also helps reduce ammonia levels in the colon, making it invaluable for constipation and hepatic encephalopathy. Start low, titrate up, and monitor for diarrhea and fluid balance. If you have any doubts or side‑effects, reach out to your healthcare provider.



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