Lactulose Eg (Lactulose)

Lactulose is used to manage conditions within the gastrointestinal and hepatic disorder families.

• Constipation: Relieves infrequent or hard stools by increasing water content in the colon.
• Hepatic encephalopathy: Lowers blood ammonia levels, helping to improve mental status in liver disease patients.
• Prevention of hepatic encephalopathy recurrence: Maintains reduced ammonia levels to reduce the risk of symptom return.

• Lactulose is a 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 and draw water into the lumen, softening stool and stimulating peristalsis. The acidic environment also converts ammonia to ammonium, reducing its absorption and lowering systemic ammonia concentrations.

Lactulose may cause a range of adverse reactions, most of which are related to its osmotic activity in the gut.

Common Side Effects

• Bloating: Sensation of abdominal fullness.
• Flatulence: Increased intestinal gas.
• Abdominal cramps: Mild to moderate cramping sensations.
• Diarrhea: Loose stools, especially with higher doses.
• Nausea: Mild queasiness.

Serious or Rare Side Effects

• Severe electrolyte imbalance: Notably low potassium or sodium levels.
• Dehydration: Excess fluid loss leading to reduced hydration.
• Allergic reaction: Rash, itching, or swelling of the face and throat.
• Severe abdominal pain: Persistent or worsening pain requiring medical attention.
• Hypernatremia: Elevated blood sodium from excessive fluid shifts.

When prescribing Lactulose, clinicians should consider several safety measures to minimize risk.

• Dose adjustment in renal impairment: Reduce dose if creatinine clearance is markedly decreased.
• Monitor electrolytes: Check serum potassium and sodium during prolonged therapy.
• Caution in diabetes: Observe blood glucose as lactulose may affect carbohydrate balance.
• Avoid abrupt discontinuation: Taper the dose to prevent rebound constipation.
• Pregnancy and lactation: Use only if the potential benefit outweighs risk; consult a specialist.
• Store at ambient temperature: Keep in the original container, protect from moisture and direct sunlight.

Lactulose can interact with other medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Concurrent use with strong laxatives (e.g., senna): May cause excessive fluid loss and electrolyte disturbances.
• Co‑administration with antidiarrheal agents (e.g., loperamide): Reduces lactulose’s intended laxative effect.

Moderate Interactions (Monitor Closely)

• Mineral supplements (magnesium, calcium): May bind lactulose and diminish its osmotic action.
• Antacids containing aluminum or magnesium: Can interfere with lactulose absorption.
• Probiotic preparations: May modify gut flora and affect ammonia‑lowering efficacy.