Lactulose Crescent Pharma (Lactulose)

Lactulose is used as an osmotic laxative to treat conditions affecting bowel function and ammonia metabolism.

• Constipation: draws water into the intestinal lumen, softening stool and increasing peristalsis to relieve chronic constipation and promote regular bowel movements.
• Hepatic encephalopathy: reduces absorption of ammonia from the gut, thereby decreasing systemic ammonia levels and assisting in the management of hepatic encephalopathy in patients with cirrhosis.
• Pediatric constipation: provides a gentle, non‑stimulant option for children with functional constipation, helping establish regular bowel habits.

• Lactulose is a synthetic disaccharide that is not absorbed in the small intestine. In the colon, bacterial enzymes hydrolyze it to short‑chain fatty acids, which increase the osmotic pressure within the lumen. The resulting influx of water softens the stool and stimulates peristalsis. Additionally, the acidic environment promotes conversion of ammonia to ammonium, reducing its absorption and lowering systemic ammonia levels.

Lactulose may cause a range of gastrointestinal and systemic reactions, varying from mild to serious.

Common Side Effects

• Abdominal bloating: sensation of fullness or swelling in the abdomen, often mild.
• Flatulence: increased intestinal gas production causing discomfort.
• Diarrhea: loose, watery stools that may occur especially at higher doses.
• Nausea: feeling of sickness or urge to vomit, usually transient.
• Stomach cramps: intermittent abdominal pain that may accompany bowel movements.
• Thirst: increased desire to drink fluids due to osmotic effect.

Serious or Rare Side Effects

• Severe electrolyte imbalance: abnormal levels of sodium, potassium, or other electrolytes that can affect heart rhythm.
• Dehydration: significant loss of body fluids leading to weakness, dizziness, or low blood pressure.
• Allergic reaction: rash, itching, swelling, or difficulty breathing indicating hypersensitivity.
• Severe abdominal pain: persistent, intense pain requiring immediate medical evaluation.
• Rectal bleeding: presence of blood in the stool or from the rectum, indicating possible mucosal injury.
• Hypernatremia: elevated blood sodium concentration that may cause neurological symptoms.

When prescribing lactulose, clinicians should consider several safety measures to minimize risks and ensure effective therapy.

• Dose adjustment in renal impairment: reduce dose and monitor renal function closely.
• Electrolyte monitoring: check serum electrolytes regularly, especially potassium and sodium.
• Caution in diabetes: monitor blood glucose as lactulose may affect carbohydrate metabolism.
• Avoid use in intestinal obstruction: contraindicated in patients with mechanical bowel blockage.
• Discontinue gradually: abrupt cessation may lead to rebound constipation; taper dose when stopping.
• Store at ambient temperature: keep below 25 °C, protect from moisture and light in the original container.

Lactulose can interact with other medicines, altering its efficacy or increasing adverse effects.

Major Interactions (Avoid)

• Concomitant use with other laxatives: may cause excessive fluid loss and electrolyte disturbances.
• Antidiarrheal agents (e.g., loperamide): can reduce lactulose’s osmotic effect and precipitate constipation.
• Strong antibiotics: may disrupt gut flora needed for lactulose metabolism, diminishing its action.

Moderate Interactions (Monitor Closely)

• Oral hypoglycemic agents: lactulose may affect glucose absorption; monitor blood sugar levels.
• Diuretics: combined effect may increase risk of electrolyte imbalance; check electrolytes regularly.
• Mineral supplements (e.g., calcium, magnesium): may bind lactulose and reduce its efficacy; separate administration times.