Duphalac 200ml

Quick links to important sections

Duphalac 200ml

Treatment option:

Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Duphalac 200ml

The following information establishes the identity, composition, and general class of the Duphalac 200ml solution, adhering strictly to non-commercial, factual standards. Duphalac is a registered brand name for a specific preparation of lactulose.

Property Description
Active Ingredient Lactulose (INN)
Form Oral Solution (viscous liquid)
Pharmacological Class Osmotic Laxative, Gastro-intestinal therapeutic agent
General Purpose Promoting bowel regularity and modulating colonic flora
Origin Synthetic Disaccharide

Duphalac 200ml: Classification and Identity

Duphalac 200ml is an oral solution classified as an osmotic laxative, which is a specific type of gastro-intestinal therapeutic agent used to promote regular bowel function. This medicinal product is designed for ingestion, operating through a non-stimulant mechanism to regulate colonic activity. Lactulose is a disaccharide used therapeutically as a cathartic. This classification signifies that the medicine works to increase the rate of bowel movements.


Composition: What is Lactulose, and is it Synthetic?

The active ingredient in the Duphalac solution is Lactulose, a synthetic disaccharide sugar manufactured from lactose. This key compound is minimally absorbed in the small intestine because the specific enzymes required for its breakdown are absent in humans, ensuring it reaches the large intestine virtually intact. Duphalac is presented as a clear, viscous liquid, with the lactulose component dissolved in an aqueous vehicle (purified water), making it suitable for oral administration across various patient groups. The active substance is provided in the form of a solution.


General Purpose and Dual Function of the Solution

The general purpose of the Lactulose Oral Solution is to assist with bowel regularity by drawing water into the colon and supporting the beneficial environment of the gut. The solution's high-level therapeutic goal is achieved through a dual function: the osmotic action helps soften the stool and increase its volume, while its secondary function involves modulating the colonic environment. The formulation is recognized for its non-habit-forming profile, making it an option for supporting sustained gastrointestinal health.

Regulatory References

  1. MedlinePlus Drug Information on Lactulose

What side effects are possible with Duphalac 200ml?

Possible Side Effects and Safety Information

The safety profile of Duphalac (lactulose solution) is defined by officially documented adverse reactions, most of which affect the gastrointestinal system, consistent with its osmotic action. Side effects are classified by frequency according to regulatory standards.

Classification Adverse Reaction System-Organ Class
Very Common Diarrhoea Gastrointestinal disorders
Common Flatulence, Abdominal pain, Nausea, Vomiting Gastrointestinal disorders
Uncommon Electrolyte imbalance Investigations
Not Known Hypersensitivity reactions (e.g., Rash, Urticaria) Immune/Skin disorders

Exposure-Related Safety Patterns

Certain effects are related to the duration of use. Flatulence and intestinal cramps are often transient, mainly occurring during the initial days of treatment. Conversely, serious adverse reactions are principally linked to chronic, excessive dosage or misuse. Such prolonged, unadjusted high doses can lead to significant fluid loss and electrolyte disturbances, including hypokalemia (low potassium) and hypernatremia (high sodium).


Population-Specific Safety and Restrictions

Official labeling defines specific constraints and monitoring requirements. The medicine is contraindicated in conditions such as Galactosaemia, Gastro-intestinal obstruction, or where there is a risk of perforation. For older adults or debilitated patients receiving long-term treatment (over six months), periodic monitoring of serum electrolytes is documented as a necessary safety consideration. Caution is also noted for diabetics receiving high doses due to the sugar content.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdosage of Duphalac oral solution is documented in official regulatory sources and primarily presents as an exacerbation of the medication's intended osmotic action. The expected clinical manifestations are centered on severe diarrhoea, abdominal pain, and abdominal cramps.

The most critical regulatory risk associated with overdosage is the potential for extensive fluid loss leading to a disturbance of the electrolyte balance. Prolonged diarrhoea may result in dangerous metabolic conditions, including specific abnormalities like hypokalemia (low serum potassium) and hypernatremia (high serum sodium). This electrolyte imbalance is specifically noted for its potential to exacerbate hepatic encephalopathy in vulnerable patients. Furthermore, regulatory documents note that infants are a specific population susceptible to dehydration and hyponatremia following overdosage.

When to Seek Urgent Medical Help

The official prescribing information requires that urgent medical attention be sought immediately if an overdose is suspected or if unusual, severe diarrheal conditions occur. The mandated management for overdosage involves prompt cessation of treatment or dose reduction. Since no specific antidote is known for lactulose, treatment is defined as purely symptomatic and supportive. The key procedural step involves the correction of electrolyte disturbances and fluid replacement to manage the complications arising from excessive fluid loss.

Therapeutic Uses of Duphalac 200ml

What Duphalac 200ml treats: main uses and benefits

Duphalac, which contains the active ingredient lactulose, is used in situations involving certain distressing symptoms across two primary therapeutic domains. The medication is commonly used to help with symptoms related to physical discomfort from chronic constipation. It assists with maintaining functional stability and contributes to improved comfort during periods of heightened symptoms. This application is recognized for the management of such symptoms.


The primary therapeutic domains where the medication is relevant are situations involving symptoms related to physical discomfort from chronic constipation and conditions associated with acute or disruptive episodes of hepatic encephalopathy (HE). Furthermore, the medication is applied across domains where additional symptomatic support is needed in conditions linked to organ-specific functional stress. It is specifically used for managing conditions associated with acute or disruptive episodes of hepatic encephalopathy (HE). Lactulose is commonly used to help with management of this condition. This supports the patient during difficult episodes by helping ease the overall symptom burden and supports general well-being during symptomatic phases.

Quick Fact: Relevant for Symptoms Related to Physical Discomfort

Eligibility and Restrictions for Use

Who Can and Cannot Use Duphalac 200ml?

The eligibility for using Duphalac (lactulose solution) is determined by strict criteria defined in official regulatory labeling, focusing on specific patient populations and existing health conditions.


Absolute Contraindications (Do Not Use)

Use is contraindicated in patients with the following conditions:

  • Galactosaemia or the requirement for a low galactose diet.
  • Gastrointestinal Obstruction, perforation, or a risk of perforation.
  • Known Hypersensitivity to lactulose or any of the product's excipients.

Age-Group Eligibility and Restrictions

Age Group Regulatory Status
Adults (18+) Use is established for chronic constipation and Hepatic Encephalopathy.
Pediatric Patients Safety and effectiveness have not been established in US labeling; use must be supervised by a doctor.
Older Adults Periodic serum electrolyte monitoring is recommended for long-term treatment (over six months).

Conditional Use and Caution

Caution is required for patients with Diabetes Mellitus or Lactose Intolerance due to the trace sugar content. Regarding physiological state, use during pregnancy is acceptable if clearly needed, but caution is advised during lactation as excretion into human milk is unknown.

What should I know about interactions with other medicines?

Duphalac 200ml Interactions with other medicines and products

The official interaction profile for Duphalac (lactulose oral solution) is documented by regulatory bodies, focusing on potential pharmacodynamic risks and local gastrointestinal effect modification.

Pharmacodynamic and Local Interaction Patterns

Co-administration with medicinal product categories classified as potassium-depleting agents carries a documented risk of increased potassium loss. This includes substances such as thiazides, corticosteroids, and Amphotericin B. The resulting hypokalemia may subsequently increase the toxicity and effect of co-administered cardiac glycosides, a specific regulatory caution.

Interaction leading to local effect modification is also documented. Broad-spectrum antibiotics, including Neomycin, may reduce the therapeutic efficacy by interfering with the colonic bacterial flora required for the product’s metabolism. Additionally, nonabsorbable antacids are documented to potentially inhibit the desired reduction of colonic pH, which may reduce the intended therapeutic effect.

Population-Specific Regulatory Notes

While the use of Duphalac is formally contraindicated in patients with galactosemia, other composition-based cautions exist. Due to the trace amounts of other sugars present, caution is advised for use in patients with Diabetes Mellitus. For elderly or debilitated patients receiving treatment for longer than six months, regulatory documents indicate the need for periodic control of serum electrolytes.

Mechanism of Action

The mechanism of Duphalac is an indirect, localized process entirely contained within the large intestine, relying on the chemical properties of Lactulose and the activity of the gut flora.

Interaction with the Colonic Microbiota

The action begins when non-absorbed Lactulose reaches the colon and serves as a substrate for local bacterial enzymes. This metabolic breakdown process, known as fermentation, produces highly soluble, low molecular weight organic acids (lactic and acetic acid). This cascade modifies the chemical composition of the intestinal contents, which is the foundational step for all subsequent physiological effects.

Osmotic Gradient and Fluid Modulation

The accumulated acids and unfermented Lactulose create a powerful osmotic gradient. This gradient actively drives water from the body's circulation into the colon lumen, which subsequently increases the volume and hydration of the intestinal contents. This process contributes to altered fluid dynamics within the bowel, resulting in altered physiological parameters related to content volume.

Mechanical Stimulation of Peristalsis

The increase in content volume and hydration results in the mechanical distention of the colon wall. This physical stretching is detected by the enteric nervous system, triggering the peristaltic reflex, which enhances the propulsive motility of the large intestine. The mechanism is a volume-driven response, facilitating the movement of the softened contents.

Dosage and Administration Information

How to Use Duphalac 200ml: Official Administration Guidelines

This section outlines the instructions for the use of the lactulose oral solution, focusing strictly on administration principles and dosing schedules.


Administration and Dosing

The medicine is administered primarily via the oral route as a solution. In acute situations involving hepatic encephalopathy (HE), the active ingredient has an approved rectal route as a retention enema. The solution may be taken with or without food; a single daily dose should be consumed at the same time each day. The dose must be measured accurately using a marked device and should be swallowed quickly.

Standard Labeled Regimens (Adults)

Indication Starting Dose Range Maintenance/Adjustment Rule
Chronic Constipation 15 to 45 mL (10–30 g) daily Adjusted to 15 to 30 mL daily, taken once or in divided doses
Hepatic Encephalopathy (HE) 30 to 45 mL (20–30 g) three to four times daily Adjusted to produce a specific target of two to three soft stools per day

Preparation and Use Conditions

To improve palatability, the prescribed dose may be administered diluted or undiluted, and can be mixed with water, fruit juice, or milk. Patients are instructed to maintain adequate fluid intake (approximately 1.5 to 2 liters daily) during the course of treatment to support the drug’s action.

Use Over Time and Population Rules

Treatment duration varies: it may be short-term for acute issues or continuous and long-term for managing HE. If a dose is missed, patients should skip the missed dose and return to the regular schedule; a double dose must not be taken. Dosing for older adults requires no special adjustment. However, pediatric use for constipation must be conducted under medical supervision, while use for pediatric HE is not established.

Recent Clinical Evidence

Evidence for Use in Chronic Constipation

Research exploring the use of lactulose for chronic constipation has primarily utilized short-term Randomized Controlled Trials (RCTs) and Systematic Reviews. These studies examined research patterns regarding changes in bowel function over defined time intervals. Researchers specifically monitored objective measures, such as weekly stool frequency and measured stool consistency using standardized scales. Findings describe patterns observed in groups of people in the studies, though results were not uniform when evaluating the solution against specific comparators studied in research. Long-term outcomes beyond a few months are not fully established by existing clinical trials.


Evidence for Use in Hepatic Encephalopathy (HE)

Lactulose was evaluated in settings involving acute and chronic episodes of Hepatic Encephalopathy (HE). Research consists of Randomized Controlled Trials (RCTs) and comprehensive Systematic Reviews that monitored outcomes related to functional imbalance, specifically looking at changes in a patient's neurological status and blood ammonia concentration levels. Evidence describes patterns related to the use of lactulose in research settings for managing this condition, which is documented in authoritative clinical guidelines. Long-term research has also been conducted to explore the use of the medicine in settings designed to monitor episode frequency over periods of up to two years.


Evidence in Special Populations and Research Gaps

For chronic constipation, evidence is available from studies that specifically evaluated the medicine in children and in older adults. For HE, the populations studied involve adults with liver cirrhosis. Researchers have noted that for both conditions, long-term effects are not fully established, and there is limited information for outcomes associated with continuous use. Additionally, ethical considerations make conducting placebo-controlled trials for acute, severe HE episodes difficult. The evidence quality varies across studies, and the comparative evidence is lacking in some areas.

Key Studies & References

  1. Lactulose - StatPearls - NCBI Bookshelf
  2. Lactulose - Summary of Product Characteristics (HPRA/EMA)

Frequently Asked Questions (FAQ)

Common questions about Duphalac 200ml (FAQ)


Q: How long after taking Duphalac can a person usually expect a bowel movement?

A: Regulatory documents often state that the therapeutic effect may take one or two days (up to 48 hours) to occur. This time frame is related to the specific process required for the medicine to work within the colon.

Q: Is it normal to experience bloating and increased flatulence with Duphalac?

A: Official safety profiles indicate that flatulence (wind) is classified as a common side effect, particularly during the initial days of treatment. This effect is often transient and typically lessens after a few days as the body adjusts.

Q: Does Duphalac affect the effectiveness of hormonal contraceptives, like the birth control pill?

A: Regulatory documents do not list a direct interaction with hormonal contraceptives. However, official guidance indicates that if severe diarrhea or vomiting occurs as a side effect, the effectiveness of oral contraceptives may potentially be reduced.

Q: Is there a risk of dehydration or electrolyte imbalance with Duphalac use?

A: Electrolyte imbalance is listed as an uncommon adverse reaction. This adverse reaction is often associated with the use of high doses over an extended period, which can result in significant fluid loss.

Q: Can Duphalac be used by children, and are there different considerations?

A: Regulatory documents describe use in children and infants as appropriate only under medical supervision. US regulatory documents state that safety and effectiveness in the pediatric population have not been established.

Q: Is Duphalac meant for short-term or chronic (long-lasting) constipation?

A: Official product information describes the medicine’s approved use for the management of chronic constipation and hepatic encephalopathy.

Q: What is the best time of day to take Duphalac for constipation?

A: Official instructions emphasize that the daily dose should be consumed at the same time each day to maintain consistency. The specific time of day (morning or evening) is not generally specified in the instructions.

Q: Is it safe to stop taking Duphalac suddenly once symptoms improve?

A: The medicine is generally described as non-habit-forming in official documentation, suggesting that reliance or withdrawal concerns are unlikely. The need for continued use is determined by individual patient requirements.

Q: Is it safe to consume alcohol while using Duphalac?

A: Some regulatory documents indicate there are no restrictions regarding the consumption of alcohol while using the medicine.

Q: Is Duphalac effective for managing chronic constipation that has lasted for years?

A: Lactulose is used for chronic constipation. Research summaries note that long-term outcomes beyond a few months are not fully established by existing clinical trials.

Q: Can Duphalac be used to soften stools if a person has haemorrhoids or anal fissures?

A: Official documents describe the solution's use in forming soft stools, which is helpful in cases such as haemorrhoids or after operations on the anus or colon where straining should be avoided.

Q: Why do some people say Duphalac is just a "synthetic sugar"?

A: The active ingredient, lactulose, is technically a synthetic disaccharide sugar manufactured from lactose. Its therapeutic action is based on the fact that it is minimally absorbed in the small intestine, allowing it to reach the colon intact.

Q: Is Duphalac safe to use during pregnancy?

A: Regulatory documents describe that the medicine is generally considered acceptable for use during pregnancy, particularly when the need has been clearly established. No effects on fertility are expected.

Q: What is the main difference between Duphalac and other over-the-counter laxatives?

A: Duphalac's active ingredient is classified as an osmotic laxative, a specific type of gastro-intestinal agent that works by drawing water into the bowel contents. Its classification as an osmotic laxative describes its mechanism of action, distinguishing it from other types of laxatives.

Q: Are there any foods or drinks that should be avoided when taking Duphalac?

A: Some regulatory documents indicate there are no restrictions on what food or drinks can be consumed while using the medicine. It may be mixed with water, fruit juice, or milk for palatability.

Q: Is it true that Duphalac should be swallowed immediately without keeping it in the mouth?

A: Official administration guidelines indicate that the measured dose should be swallowed quickly.

Q: Is there a risk of withdrawal symptoms when stopping Duphalac after prolonged use?

A: The medicine is generally described as non-habit-forming in official documentation, suggesting that reliance or withdrawal concerns are unlikely.

Q: What is the difference between Duphalac and a stool softener?

A: Duphalac is classified as an osmotic laxative, a specific type of gastro-intestinal agent that works by drawing water into the colon contents.

Q: What is the shelf life of Duphalac 200ml after the bottle has been opened?

A: Some regulatory documents advise that the product should be used within 12 months of first opening, provided it is stored according to the instructions.

Q: Does Duphalac require a prescription or is it available over-the-counter?

A: The regulatory status of the product (prescription versus over-the-counter) can vary depending on the country or region of sale.

Q: What happens if a person is lactose intolerant and takes Duphalac?

A: Regulatory documents advise caution for patients who cannot digest milk sugar (lactose intolerant) due to the trace amounts of sugars, including lactose, that may be present in the solution.

How should Duphalac 200ml be stored and disposed of?

Storage Requirements

The Duphalac oral solution must be stored not above 25^circC. The official labeling provides explicit instructions not to refrigerate or freeze the product to maintain its stability. Storing the solution at temperatures exceeding 30^circC or exposing it to prolonged direct light may cause an extreme change in the liquid.

For safety, the product must be kept out of the sight and reach of children. The solution must not be used after the expiry date printed on the label, as this date refers to the last day of the stated month.

Disposal Instructions

Official disposal guidance states that this medicine must not be disposed of via wastewater or household waste, as these measures are intended to protect the environment. Consumers are required to ask a pharmacist how to dispose of any medicines that are no longer needed or have expired, often by returning the remaining product to the pharmacy.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

Equivalent of Duphalac 200ml found in:

A-Z Index: