Description
Osmolax is a gentle osmotic laxative whose active component is lactulose (approximately 3.35 g per 5 ml). It’s formulated to relieve constipation and support liver-related conditions like hepatic encephalopathy.
How It Works (Mechanism of Action)
Upon reaching the colon, lactulose is fermented by bacteria into organic acids (mainly lactic acid). This results in two key actions:
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Osmotic activity — drawing water into the colon to soften stool and stimulate peristalsis.
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Acidification — converting ammonia (NH₃) into ammonium (NH₄⁺), aiding in ammonia elimination—especially beneficial in hepatic encephalopathy.
Indications & Uses
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Chronic or incidental constipation, particularly when lifestyle measures (fiber, fluids, exercise) fall short.
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Hepatic encephalopathy — helps reduce ammonia levels in patients with liver disorders.
Dosage & Administration
| Age Group / Purpose | Typical Dose |
|---|---|
| Constipation (Adults) | 15–30 ml once or divided daily; adjust as needed. |
| Children (5–10 yrs) | 10 ml twice daily; dosage varies by age. |
| Infants (<1 yr) | ~2.5 ml twice daily. |
| Hepatic encephalopathy (Adults) | 30–50 ml three times daily; titrate to produce 2–3 soft stools/day. |
| Rapid effect (acute situations) | Hourly dosing (6–9 tsp/hr) until relief achieved. |
– Take with or without food, shake well before use. Effects typically begin within 1–3 days.
Safety, Side Effects & Precautions
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Common side effects: initial bloating, flatulence, abdominal cramps—usually fade with continued use.
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Overdose risks: diarrhea, dehydration, and electrolyte imbalances (e.g., hypokalemia).
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Contraindications: galactosemia, suspected gut obstruction, lactose intolerance.
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Precautions: diabetic patients should consider sugar content. Safe during pregnancy and lactation—Category B.
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Drug interactions: Minimal—but note that excessive use may potentiate digitalis effect due to potassium loss.
Fast Facts Summary
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Active Ingredient: Lactulose 3.35 g per 5 ml
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Form: Oral syrup (100 ml)
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Main Uses: Relief from constipation; managing hepatic encephalopathy
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Onset of Action: 1–3 days
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Common Side Effects: Mild gastrointestinal discomfort; diarrhea if overdosed
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Key Precautions: Avoid in galactosemia, monitor electrolytes with prolonged use; safe in pregnancy when used appropriately
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