constilac laxative syrup - Lactulose (10gm/15ml) medicine

Ahalac Liquid Laxative: Complete Guide to Uses, Dosage, and Safety

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🏭 Enrico Pharmaceuticals 📦 Varies by brand 💊 Allopathy 📅 Updated: Sep 25, 2026
⚠️ Hepatotoxicity Risk 📋 Prescription Required 💊 Generic Available
Medically Reviewed
12 min read
Evidence: Well-established for constipation and hepatic encephalopathy.
Reviewed by
SaathiMed Expert Panel | Sep 25, 2026

When to Call Your Doctor IMMEDIATELY

  • Severe or persistent diarrhea
  • Signs of dehydration (dry mouth, decreased urine, dizziness)
  • Severe abdominal pain or cramping
  • Blood in stool or vomit
  • Allergic reaction (rash, itching, swelling, difficulty breathing)
  • Muscle weakness or irregular heartbeat (possible electrolyte imbalance)
  • Confusion or increased drowsiness in liver disease patients

If experiencing severe symptoms, call emergency services immediately.

What is constilac laxative syrup used for?

This medicine is an oral liquid laxative containing lactulose. It treats constipation by drawing water into the bowel to soften stool, and it also lowers blood ammonia in liver disease. It usually works within 24 to 48 hours.

  • Generic Name: Lactulose
  • Manufacturer: Enrico Pharmaceuticals
  • Form: Allopathy
  • Pregnancy Category: Consult doctor
  • Prescription Required: Yes

🇮🇳 constilac laxative syrup के बारे में (Hindi Summary)

उपयोग: यह दवा कब्ज (कब्ज) के इलाज के लिए इस्तेमाल की जाती है। यह मल को नरम करके आंतों को साफ करने में मदद करती है। यह लीवर की बीमारी में अमोनिया के स्तर को कम करने के लिए भी दी जाती है। यह आमतौर पर 24 से 48 घंटे में असर दिखाती है।

साइड इफेक्ट्स: इस दवा के आम दुष्प्रभावों में पेट में गैस, सूजन, ऐंठन और दस्त शामिल हैं। ये आमतौर पर हल्के होते हैं और कुछ दिनों में ठीक हो जाते हैं। अगर गंभीर दस्त, निर्जलीकरण, या एलर्जी हो तो तुरंत डॉक्टर से संपर्क करें।

सुरक्षा सलाह: इस दवा को लेने से पहले अपने डॉक्टर को अपनी सभी स्वास्थ्य समस्याओं और दवाओं के बारे में बताएं। अगर आपको गैलेक्टोसीमिया, आंतों में रुकावट, या गंभीर आंतों की बीमारी है तो यह दवा न लें। गर्भावस्था या स्तनपान के दौरान डॉक्टर से सलाह लें। पर्याप्त पानी पिएं। बिना डॉक्टर की सलाह के 2 हफ्ते से ज्यादा इस्तेमाल न करें।

💡 Did You Know? India has the highest number of USFDA-compliant plants outside the USA.

💊 constilac laxative syrup Uses & Benefits

[{"condition":"Constipation","description":"This medicine is used to treat occasional and chronic constipation by softening the stool and promoting bowel movements.","evidence":"Well-established"},{"condition":"Hepatic encephalopathy","description":"This medicine helps lower blood ammonia levels in patients with liver disease, improving mental function and reducing symptoms of confusion.","evidence":"Well-established"},{"condition":"Chronic constipation in pregnancy","description":"This medicine is sometimes recommended for constipation during pregnancy when other treatments are not suitable, under medical supervision.","evidence":"Moderate"},{"condition":"Constipation in elderly","description":"This medicine is commonly used in older adults to relieve constipation, as it is gentle and effective.","evidence":"Well-established"}]

Off-label uses: [{"condition":"Small intestinal bacterial overgrowth (SIBO)","description":"This medicine may be used as a breath test substrate to diagnose SIBO, but not as a treatment.","evidence":"Limited"},{"condition":"Prebiotic use","description":"This medicine can act as a prebiotic, promoting the growth of beneficial gut bacteria, but this is not a primary approved use.","evidence":"Limited"}]

Primary treatment for: Constipation

Also treats: Hepatic encephalopathy, Chronic constipation in pregnancy, Constipation in elderly

📋 Drug Information

Generic Name(s)Lactulose
Brand NameAhalac Liquid Laxative
ManufacturerEnrico Pharmaceuticals
Packaging / FormVaries by brand (Allopathy)
Therapeutic ClassGASTRO INTESTINAL
Action ClassOsmotic laxatives/Purgative
Route of AdministrationOral
StorageStore at room temperature between 15°C and 30°C (59°F to 86°F). Do not freeze. Keep the bottle tightly closed. Protect from light.
Shelf Life24 months from the date of manufacture, unless otherwise stated on the packaging.
WHO GuidelineNot established from the available information.
ICMR GuidelineNot established from the available information.

👨‍⚕️ Doctor's Practical Tips

Evidence-based practical advice from experienced clinicians

1
Take this medicine with a full glass of water to help it work and prevent dehydration.
2
Measure the dose accurately using the provided measuring cup; do not use a kitchen spoon.
3
Be patient; this medicine takes 24 to 48 hours to produce a bowel movement.
4
If you have diabetes, monitor your blood sugar levels as this medicine contains sugars.
5
Do not take other laxatives without consulting your doctor, as this can cause severe diarrhea.
6
If you experience severe diarrhea, stop the medicine and contact your doctor immediately.
7
For hepatic encephalopathy, your doctor may adjust the dose to achieve 2 to 3 soft stools per day.

🔍 Is This Medicine Right for Your Symptom?

Educational reference. Always consult a doctor for diagnosis.

✅
Constipation
This medicine is commonly prescribed for this.
Likely Use
✅
Hepatic encephalopathy
This medicine is used to lower ammonia in liver disease.
Likely Use
❌
Fever
This medicine is not a fever reducer.
Not Primary
❌
Acute diarrhea
This medicine is not for treating diarrhea; it can cause it.
Not Primary

🔬 How This Medicine Works (Pharmacology)

Pharmacokinetics

AbsorptionLactulose is poorly absorbed from the gastrointestinal tract. Only about 0.4% to 2% of an oral dose is absorbed unchanged. The majority reaches the colon where it exerts its effects.
DistributionAbsorbed lactulose is distributed in extracellular fluid. It does not bind to plasma proteins significantly.
Protein BindingNot established from the available information.
MetabolismLactulose is metabolized by colonic bacteria into lactic acid, acetic acid, and other short-chain fatty acids. It is not metabolized by human enzymes.
Half-LifeNot established from the available information.
ExcretionUnabsorbed lactulose and its metabolites are excreted in the feces. The small amount absorbed is excreted unchanged in the urine.
BioavailabilityVery low, approximately 0.4% to 2% of an oral dose is absorbed.
Onset of ActionLaxative effect: 24 to 48 hours. Ammonia-lowering effect: may take 24 to 48 hours.
Peak Plasma TimeNot established from the available information.
Duration of ActionThe laxative effect lasts until the next bowel movement, typically within 24 to 48 hours after dosing.

How It Works

This medicine works by osmosis. Lactulose is a synthetic disaccharide that is not absorbed from the gastrointestinal tract. When it reaches the colon, it is broken down by bacteria into lactic acid, acetic acid, and other organic acids. These acids draw water into the colon, which softens the stool and increases bowel movements. In hepatic encephalopathy, the acidification of the colon traps ammonia in the form of ammonium ions, which are then excreted in the stool, reducing blood ammonia levels.

Mechanism Steps

1
Ingestion and passage: This medicine is swallowed and passes through the stomach and small intestine without being absorbed.
2
Bacterial fermentation: In the colon, bacteria ferment lactulose into short-chain fatty acids, mainly lactic acid and acetic acid.
3
Osmotic effect: These acids draw water into the colon, increasing stool water content and softening the stool.
4
Ammonia trapping: The acidic environment converts ammonia to ammonium ions, which are less absorbable and are excreted in stool.
5
Bowel movement: The increased water and volume stimulate bowel contractions, leading to a bowel movement.

💡 How to Take constilac laxative syrup

Strength: Lactulose 10 g per 15 mL oral liquid.

1Shake the bottle well before each use.
2Measure the dose accurately using the provided measuring cup or spoon.
3Take this medicine orally, with or without food.
4Drink a full glass of water or juice after taking the dose to help it work and prevent dehydration.
5Take at the same time each day for best results.
6Do not take more than the recommended dose.
7If you have diabetes, monitor your blood sugar as advised.

Dosage Information

Adult DosageThe usual adult dose for constipation is 15 to 30 mL (10 to 20 g) once daily, preferably with a full glass of water. For hepatic encephalopathy, the dose is typically 30 to 45 mL (20 to 30 g) three to four times daily, adjusted to produce 2 to 3 soft stools per day. Dose must be individualized by a qualified clinician based on indication, age, weight, renal and hepatic function.
Pediatric DosagePediatric dosing is not established from available information. Consult a pediatrician.
Elderly DosageElderly patients may start with a lower dose, such as 15 mL once daily, and adjust based on response. Close monitoring for dehydration and electrolyte imbalance is advised. Dose must be individualized by a qualified clinician.
Renal ImpairmentNo specific dose adjustment is established for renal impairment. However, use with caution and monitor electrolytes due to risk of dehydration from diarrhea. Consult a doctor.
Hepatic ImpairmentNo specific dose adjustment is needed for hepatic impairment. This medicine is used to treat hepatic encephalopathy. Dose is adjusted based on clinical response and ammonia levels. Consult a doctor.
Maximum Daily DoseFor constipation: up to 60 mL per day. For hepatic encephalopathy: up to 180 mL per day, as directed by a doctor. Do not exceed the prescribed dose.

Dosage Timeline

🌅 Morning ❌ ☀️ Afternoon ❌ 🌆 Evening ❌ 🌙 Night ❌

🍽️ Food Timing Guide

With or without food
Can be taken at any time
Food does not affect the action of this medicine.
Water
Drink plenty
Helps the medicine work and prevents dehydration.
High-fiber foods
Encouraged
Complementary to laxative effect.

⏰ What to Do If You Miss a Dose

📌 Less than half the dosing interval has passed
→ Take the missed dose as soon as you remember.
💡 Continue with the regular schedule.
📌 More than half the dosing interval has passed
→ Skip the missed dose.
💡 Do not double dose to catch up.

⚠️ Side Effects of constilac laxative syrup

✅ Common Side Effects

Gas (flatulence) (Common (10-20%))
Usually resolves with continued use. If bothersome, consult your doctor.
Abdominal bloating (Common (10-20%))
Take with plenty of water. If persistent, consult your doctor.
Abdominal cramps (Common (5-10%))
Usually temporary. If severe, contact your doctor.
Nausea (Uncommon (1-5%))
Take with food or juice to reduce nausea.
Diarrhea (Uncommon (1-5%))
Reduce dose or stop and consult your doctor if severe.

🚨 Serious Side Effects

Severe diarrhea leading to dehydration and electrolyte imbalance (Rare (<0.1%))
Stop the medicine and seek immediate medical attention if you have persistent watery stools, weakness, or dizziness.
Allergic reaction (rash, itching, swelling, difficulty breathing) (Rare (<0.1%))
Seek emergency medical help immediately.
Hypokalemia (low potassium) (Rare (<0.1%))
Report muscle weakness, cramps, or palpitations to your doctor.

⚠️ Rare Side Effects

Hypernatremia (high sodium)
Seek medical attention if you experience excessive thirst, confusion, or seizures.
Pneumatosis intestinalis (gas in bowel wall)
Report abdominal pain, bloating, or blood in stool to your doctor immediately.

Consult your doctor if you experience any unusual symptoms.

🔬 Drug Interactions

Drug Severity Effect
Other laxatives Major
Antacids Moderate
Diuretics Moderate
Corticosteroids Moderate
Oral antibiotics Minor

🚨 Major Interactions

  • Other laxatives (e.g., stimulant laxatives)
  • Antacids (non-absorbable)

⚡ Moderate Interactions

  • Diuretics
  • Corticosteroids

🍷 Alcohol Interaction

Alcohol may worsen dehydration and electrolyte imbalance caused by diarrhea. It is advisable to avoid alcohol while taking this medicine, especially if you experience diarrhea.

🔎 Check Your Other Medicines

Educational tool. Always confirm with your doctor or pharmacist.

🛡️ Safety & Warnings

🚫 Contraindications

["Galactosemia (a rare genetic condition where the body cannot process galactose)","Intestinal obstruction or blockage","Gastrointestinal perforation","Severe inflammatory bowel disease (e.g., ulcerative colitis, Crohn's disease) during acute flare","Known allergy to lactulose or any component of the formulation"]

⚠️ Warnings & Precautions

["Do not use this medicine for more than 2 weeks without consulting a doctor.","Use with caution in patients with diabetes mellitus; monitor blood sugar as lactulose contains galactose and lactose.","Elderly patients may be more susceptible to electrolyte imbalances from diarrhea.","Patients with renal impairment should use with caution and monitor electrolytes.","Stop use and consult a doctor if severe diarrhea occurs.","Do not take other laxatives without medical advice.","Keep out of reach of children.","Inform your doctor if you are pregnant, planning pregnancy, or breastfeeding."]

🤱 Lactation Safety

Lactulose is not absorbed significantly into the bloodstream and is unlikely to pass into breast milk in harmful amounts. It is considered safe for use during breastfeeding. Consult your doctor for guidance.

💊 Overdose Management

Overdose of this medicine may cause severe diarrhea, abdominal cramps, dehydration, and electrolyte imbalance. If you suspect an overdose, stop the medicine and seek immediate medical attention. Treatment is supportive, including rehydration and electrolyte replacement. Contact a poison control center or emergency room if symptoms are severe.

⏰ Missed Dose

If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not double the dose to catch up.

Additional Safety Advice

General Safety

Before taking this medicine, tell your doctor if you are allergic to lactulose or any other sugars. Inform your doctor if you have diabetes, because this medicine contains sugars that may affect blood sugar levels, although the amount absorbed is minimal. If you have a condition called galactosemia or a galactose-free diet, you must not take this medicine. Do not use this medicine if you have a bowel obstruction, perforation, or severe inflammatory bowel disease. If you are pregnant or breastfeeding, consult your doctor before using this medicine. Do not take other laxatives without medical advice, as this may cause excessive fluid loss. Drink plenty of water and fluids while taking this medicine to prevent dehydration. If you experience severe diarrhea, stop the medicine and seek medical attention. Keep this medicine out of reach of children. Do not use it for more than two weeks without consulting a doctor. If your constipation does not improve after a few days, contact your healthcare provider.

👴 Special Considerations for Elderly

💡 For Patients Above 65

Elderly patients may be more sensitive to the effects of this medicine, especially dehydration and electrolyte imbalance from diarrhea. Start with a lower dose and monitor closely. Ensure adequate fluid intake.

🤰 Pregnancy Planning (TTC)

If you are planning pregnancy, consult your doctor before using this medicine. It is generally considered safe, but medical advice is recommended.

🏥 Post-Surgery Considerations

This medicine may be used after surgery to prevent constipation, but only under medical supervision. Inform your surgeon if you are taking it.

🦷 Dental Procedures

No specific precautions are needed for dental procedures. Inform your dentist about all medicines you take.

💚 Lifestyle Tips for Better Results

🏃
Drink plenty of water throughout the day to help prevent constipation.
🥗
Include fiber-rich foods like fruits, vegetables, and whole grains in your diet.
😴
Exercise regularly to promote healthy bowel movements.
💧
Establish a regular bathroom routine, preferably after meals.
🧘
Avoid delaying the urge to have a bowel movement.
🌞
Manage stress, as it can affect digestion.

🏋️ Exercise Considerations

No specific exercise restrictions are required while taking this medicine. However, if you experience dizziness or weakness from diarrhea, avoid strenuous exercise until you feel better.

🥗 Diet Recommendations

Increase fiber intake with fruits, vegetables, and whole grains.
Stay well hydrated by drinking water and clear fluids.
Limit processed foods and high-fat foods that can worsen constipation.
Include probiotics like yogurt to support gut health.
Avoid excessive caffeine and alcohol, which can dehydrate you.

💼 Impact on Daily Work & Life

This medicine generally does not affect your ability to work or drive. However, if you experience dizziness or severe diarrhea, avoid driving or operating machinery until you feel well. It may cause frequent bowel movements, so plan accordingly.

🛑 When to Stop This Medicine

Stop taking this medicine and consult your doctor if you experience severe diarrhea, signs of dehydration, allergic reactions, or if your constipation does not improve after 2 weeks. Do not stop prescribed therapy for hepatic encephalopathy without medical advice.

📅 Long-Term Use Effects

Long-term use of this medicine is generally safe when supervised by a doctor. However, prolonged high doses can lead to electrolyte imbalances, especially low potassium and sodium. It may also cause persistent bloating and gas. Regular monitoring of electrolytes and kidney function is advised for long-term use. Do not use for more than 2 weeks without medical advice.

🌿 Non-Medicine Approaches

These can complement medicine but do not replace prescribed treatment.

Dietary fiber and hydration

Increasing fiber and water intake can help relieve mild constipation.

Evidence: Well-established
Polyethylene glycol 3350

Another osmotic laxative that works similarly but does not lower ammonia.

Evidence: Well-established
Probiotics

May improve gut health and regularity, but evidence is mixed.

Evidence: Limited

💉 Vaccination Considerations

💉 If You're Getting Vaccinated

No specific vaccine interactions are known with this medicine. Continue routine vaccinations as scheduled.

📦 Storage Guide

✅ DO

Store at room temperature (15-30°C)

❌ DON'T

Do not refrigerate unless specified

✅ DO

Keep in original container

❌ DON'T

Do not transfer to unmarked containers

✅ DO

Keep away from direct sunlight

❌ DON'T

Do not store in bathroom cabinet

✅ DO

Keep bottle tightly closed

❌ DON'T

Do not use after expiry date

✈️ Traveling with This Medicine

When traveling, carry this medicine in its original packaging with the prescription label. Keep a copy of your prescription with you. Store at room temperature and protect from light. If crossing time zones, continue your regular dosing schedule; for hepatic encephalopathy, consult your doctor for adjustments. Declare the medicine at customs if required. Carry enough for your trip and a little extra in case of delays.

💰 Cost Analysis & Savings

👥 Real Patient Stories

Educational, anonymized scenarios. Individual results may vary.

👤 A 50-year-old man with chronic constipation
He had been struggling with hard stools and straining for years. His doctor prescribed this medicine. After two days, he noticed softer stools and less straining. He learned to take it with plenty of water and to be patient for the effect.
💡 Lesson: This medicine works gradually and requires consistent use and adequate hydration for best results.
👤 A 65-year-old woman with liver cirrhosis and confusion
She was experiencing episodes of confusion due to hepatic encephalopathy. Her doctor started this medicine to lower ammonia levels. Within a few days, her mental clarity improved, and she was able to resume daily activities. She had some bloating initially, which subsided.
💡 Lesson: This medicine can significantly improve mental function in liver disease by reducing ammonia, but side effects like bloating are common initially.

💬 Questions Patients Often Ask

Q: How long does it take to work?

A: This medicine usually takes 24 to 48 hours to produce a bowel movement. It is not a quick-acting laxative.

Q: Can I take this medicine every day?

A: It can be taken daily for short periods, but long-term use should be supervised by a doctor.

Q: Is this medicine safe for diabetics?

A: It contains small amounts of sugars, but absorption is minimal. Monitor blood sugar as advised by your doctor.

Q: Can I take this medicine during pregnancy?

A: It is generally considered safe during pregnancy, but consult your doctor before use.

Q: What are the side effects?

A: Common side effects include gas, bloating, and abdominal cramps. Severe diarrhea is rare but requires medical attention.

🤔 Common Patient Concerns

💭 These are the concerns patients most commonly raise

  • Can I take this medicine long-term?
  • Will it affect my blood sugar?
  • Can I drive after taking this medicine?
  • Does it interact with my blood pressure medicine?
  • What if I miss a dose?
  • Can I drink alcohol while taking this?
  • Is it safe for my kidneys?
  • Can I take it with other laxatives?

🔄 Substitutes for constilac laxative syrup

View All

Alternative brands with exact same active ingredient:

Medical Note: Always consult your doctor before switching medications.

🛑 Myths vs. Facts

  • Myth: This medicine works immediately like a stimulant laxative.
    Fact: This medicine takes 24 to 48 hours to produce a bowel movement. It is not a quick-fix laxative.
  • Myth: This medicine is safe for everyone.
    Fact: It is not safe for people with galactosemia or intestinal obstruction. Always consult a doctor.
  • Myth: This medicine can be used for weight loss.
    Fact: This medicine is not a weight-loss product. It is used for constipation and liver conditions.
  • Myth: This medicine is addictive.
    Fact: This medicine is not habit-forming. However, long-term use should be supervised by a doctor.

🔄 Alternative Options

Generic Alternatives

  • Lactulose 10 g/15 mL oral solution

Brand Alternatives

  • Duphalac
  • Lactihep
  • Looz
  • Cephulac

📊 Comparison with Similar Medicines

[{"medicine":"Lactulose","class":"Osmotic laxative","onset":"24-48 hours","uses":"Constipation, hepatic encephalopathy","notes":"Also lowers ammonia"},{"medicine":"Polyethylene glycol 3350","class":"Osmotic laxative","onset":"24-48 hours","uses":"Constipation","notes":"Does not lower ammonia"},{"medicine":"Lactitol","class":"Osmotic laxative","onset":"24-48 hours","uses":"Constipation, hepatic encephalopathy","notes":"Similar to lactulose"}]

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