Lactulose Ratiopharm (Lactulose)

• Lactulose is an osmotic laxative used to manage conditions that involve impaired bowel motility or excess ammonia production.
• Constipation: softens stool and promotes regular bowel movements, relieving chronic constipation.
• Hepatic encephalopathy: reduces intestinal ammonia absorption, helping to improve mental status in patients with liver disease.
• Prevention of recurrent hepatic encephalopathy: maintains low ammonia levels to decrease the risk of episodic neurocognitive decline.

• Lactulose is a synthetic disaccharide that is not absorbed in the small intestine. In the colon it is metabolised by bacterial flora into short‑chain fatty acids, which increase the osmotic pressure within the lumen. This draws water into the bowel, softening stool and stimulating peristalsis. In patients with liver disease, the acidic environment traps ammonia as ammonium, reducing its systemic absorption and lowering blood ammonia concentrations.

Lactulose may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Abdominal bloating: sensation of fullness or swelling in the abdomen.
• Flatulence: increased intestinal gas production.
• Diarrhoea: loose, watery stools, especially at higher doses.
• Nausea: mild feeling of queasiness.
• Stomach cramps: intermittent abdominal pain.
• Thirst: increased desire to drink fluids.

Serious or Rare Side Effects

• Severe electrolyte imbalance: marked changes in sodium or potassium levels.
• Dehydration: excessive fluid loss leading to low blood volume.
• Allergic reaction: rash, itching, swelling, or difficulty breathing.
• Severe abdominal pain: persistent or worsening pain requiring medical attention.

• Before initiating Lactulose therapy, several safety considerations should be reviewed.
• Assess renal function: ensure adequate kidney performance to handle fluid shifts.
• Monitor electrolytes: check sodium, potassium and bicarbonate levels during treatment.
• Use caution in diabetes: lactulose may affect glucose metabolism; monitor blood sugar.
• Avoid in intestinal obstruction: the drug can exacerbate blockage and cause perforation.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Lactulose can influence the pharmacokinetics or safety profile of other medicines.

Major Interactions (Avoid)

• Concurrent use with magnesium‑containing laxatives: risk of severe diarrhoea and electrolyte loss.
• Co‑administration with oral antibiotics: may diminish lactulose’s efficacy in reducing ammonia.

Moderate Interactions (Monitor Closely)

• Antidiabetic agents: lactulose may alter glucose absorption; monitor blood glucose.
• Diuretics: increased risk of dehydration; assess fluid balance.
• Proton pump inhibitors: possible alteration of gut flora that could affect lactulose metabolism.