Lactulose Eg (Lactulose)

Lactulose acts on the gastrointestinal tract to manage conditions that benefit from increased osmotic activity and ammonia reduction.

• Constipation: softens stools and promotes regular bowel movements in patients with functional constipation.
• Hepatic encephalopathy: lowers intestinal ammonia production to help control episodes of hepatic encephalopathy.

• Lactulose is a synthetic disaccharide that reaches the colon unchanged, where bacterial flora hydrolyze it to short‑chain fatty acids. The resulting acidification lowers colonic pH, converting ammonia (NH3) to ammonium (NH4+), which is poorly absorbed, and creates an osmotic gradient that retains water in the lumen, softening stool and facilitating evacuation.

Lactulose may cause several adverse reactions, ranging from mild to serious.

Common Side Effects

• Abdominal bloating: sensation of fullness or swelling in the abdomen.
• Flatulence: increased intestinal gas production.
• Diarrhea: loose, watery stools, especially during dose titration.
• Nausea: mild upset stomach.
• Abdominal cramps: intermittent painful contractions.

Serious or Rare Side Effects

• Severe dehydration: excessive fluid loss from prolonged diarrhea.
• Electrolyte imbalance: abnormal serum potassium or sodium levels.
• Allergic reaction: rash, itching, or swelling of the face and throat.
• Rectal bleeding: blood in stool indicating mucosal irritation.

Before initiating lactulose therapy, consider the following safety measures.

• Dose titration: adjust the dose to achieve 2–3 soft stools per day.
• Fluid intake: maintain adequate hydration to offset osmotic water loss.
• Electrolyte monitoring: check serum electrolytes during long‑term use.
• Renal impairment: use with caution in patients with reduced kidney function.
• Pregnancy and lactation: consult the prescriber as safety data are limited.
• Store at ambient temperature: keep in the original container, protect from moisture and heat.

Lactulose can interact with other medicines, influencing efficacy or safety.

Major Interactions (Avoid)

• Antibiotics that alter gut flora (e.g., rifaximin): may diminish lactulose’s ammonia‑lowering effect.
• Antidiarrheal agents (e.g., loperamide): can counteract lactulose’s laxative action.

Moderate Interactions (Monitor Closely)

• Mineral supplements (e.g., magnesium, calcium): may affect absorption or increase gastrointestinal side effects.
• Diabetes medications: lactulose may influence glucose control in some patients.
• Oral potassium binders: potential for altered potassium levels.