Normase (Lactulose)

• Normase (lactulose) is an osmotic laxative employed in gastrointestinal and hepatic conditions.
• Constipation: softens stool and promotes regular bowel movements.
• Hepatic encephalopathy: lowers blood ammonia levels, helping to improve mental status.
• Prevention of encephalopathy recurrence: maintains reduced ammonia concentrations to reduce relapse risk.

• In the colon, lactulose is metabolized by resident bacteria into short‑chain fatty acids such as lactic and acetic acid. These acids increase the osmotic pressure within the lumen, drawing water into the bowel and softening stool. The resulting acidification also traps ammonia as ammonium, decreasing its absorption and thereby lowering systemic ammonia levels in hepatic encephalopathy.

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 or distension
• Flatulence or excessive gas
• Diarrhea or loose stools
• Nausea or mild stomach discomfort
• Cramping or abdominal pain
• Increased thirst

Serious or Rare Side Effects

• Severe electrolyte imbalance (e.g., hyponatremia, hypokalemia)
• Marked dehydration requiring medical attention
• Allergic reactions such as rash, itching, or swelling
• Severe abdominal pain or colitis
• Persistent vomiting
• Rare cases of hepatic decompensation in vulnerable patients

• When using lactulose, certain precautions help ensure safe and effective therapy.
• Dose adjustment in renal impairment: monitor renal function and adjust dose if needed.
• Electrolyte monitoring: check serum electrolytes regularly, especially with prolonged use.
• Caution in diabetes: lactulose contains a small amount of sugar; monitor blood glucose.
• Avoid in intestinal obstruction: do not use if a mechanical blockage is present.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

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

Major Interactions (Avoid)

• Antacids containing magnesium: may increase osmotic load and cause severe diarrhea.
• Loop or thiazide diuretics: heightened risk of electrolyte disturbances.
• Rifampin: may reduce lactulose's effectiveness in lowering ammonia.

Moderate Interactions (Monitor Closely)

• Broad‑spectrum antibiotics: can alter gut flora and affect lactulose metabolism.
• Probiotic supplements: may modify bacterial conversion of lactulose.
• Other laxatives or stool softeners: additive laxative effect may lead to excessive bowel movements.