Lactulose Leidapharm (Lactulose)

Lactulose is used to manage conditions that involve impaired bowel motility or excess ammonia production.

• Constipation: softens stool and increases bowel movements, providing relief from chronic constipation.
• Hepatic encephalopathy: lowers intestinal ammonia absorption, helping to improve mental status in patients with liver disease.
• Prevention of hepatic encephalopathy recurrence: used as maintenance therapy to reduce the risk of repeat episodes in chronic liver disease.

• In the colon, lactulose is metabolized by resident bacteria into short‑chain fatty acids, which lower the luminal pH. The resulting acidification creates an osmotic gradient that draws water into the intestinal lumen, increasing stool volume and promoting laxation, while also trapping ammonia in the gut and reducing its systemic absorption.

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

Common Side Effects

• Abdominal bloating: feeling of fullness or swelling in the abdomen.
• Flatulence: increased intestinal gas production.
• Diarrhea: loose, watery stools, especially at higher doses.
• Nausea: mild discomfort or urge to vomit.
• Abdominal cramps: intermittent pain or tightening of the stomach muscles.
• Thirst: increased desire for fluids due to fluid loss.

Serious or Rare Side Effects

• Severe dehydration: excessive fluid loss leading to low blood pressure.
• Electrolyte imbalance: abnormal levels of sodium, potassium, or magnesium.
• Allergic reaction: rash, itching, swelling, or difficulty breathing.
• Persistent abdominal pain with blood in stool: may indicate gastrointestinal injury.

When prescribing lactulose, clinicians should consider several safety measures to minimise risk.

• Renal function assessment: evaluate kidney status before initiating therapy.
• Electrolyte monitoring: check serum electrolytes periodically, especially in patients prone to dehydration.
• Diabetes caution: lactulose contains sugars; monitor blood glucose in diabetic patients.
• Intestinal obstruction avoidance: do not use in patients with known mechanical blockage of the bowel.
• Hydration encouragement: advise patients to maintain adequate fluid intake.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Lactulose can influence the absorption or effect of other medicines, requiring attention to potential interactions.

Major Interactions (Avoid)

• Narrow‑therapeutic‑index drugs (e.g., digoxin): reduced absorption may lead to sub‑therapeutic levels.
• Oral antibiotics with limited absorption (e.g., tetracycline): accelerated transit can diminish efficacy.

Moderate Interactions (Monitor Closely)

• Diuretics: increased risk of electrolyte disturbances when combined with lactulose‑induced fluid loss.
• Insulin or oral hypoglycemics: sugar content may affect glucose control; monitor blood sugar.
• Probiotics: altered gut flora may modify lactulose metabolism; observe clinical response.
• Antacids: may change gastric pH and affect lactulose breakdown; assess symptom control.