Importal Ex-Lax
Osmotic Laxative for Constipation and Hepatic Encephalopathy
Quick Facts About Importal Ex-Lax
Key Takeaways About Importal Ex-Lax
- Gentle osmotic action: Lactitol is a sugar alcohol that is not absorbed in the gut; it draws water into the colon to soften stools and stimulate natural bowel movements without irritating the intestinal wall
- Safe for diabetics: Importal Ex-Lax has no effect on blood sugar or insulin levels, making it suitable for patients with diabetes mellitus
- Dual use: Besides treating constipation, lactitol is used in hospitals to manage hepatic encephalopathy by reducing blood ammonia levels through colonic acidification
- Easy to take: The powder dissolves in any hot or cold drink or can be sprinkled on food; the entire daily dose is taken once, ideally with a meal
- Short-term use recommended: Do not use for more than 2 weeks without consulting a doctor; persistent constipation should always be medically evaluated
What Is Importal Ex-Lax and What Is It Used For?
Importal Ex-Lax is an osmotic laxative containing lactitol monohydrate. It is used to treat constipation in adults and children and may also be used as part of the treatment of hepatic encephalopathy, a serious complication of advanced liver disease.
Constipation is one of the most common gastrointestinal complaints worldwide, affecting an estimated 10–15% of the global population according to the World Gastroenterology Organisation (WGO). It is characterised by infrequent bowel movements, hard or lumpy stools, straining during defecation, and a feeling of incomplete evacuation. While often considered a minor inconvenience, chronic constipation can significantly impair quality of life and may indicate underlying health problems.
Importal Ex-Lax belongs to the class of osmotic laxatives, which work by drawing water into the large intestine. Its active ingredient, lactitol monohydrate, is a synthetic disaccharide (sugar alcohol) that is not absorbed from the gastrointestinal tract. After oral administration, lactitol passes through the stomach and small intestine unchanged and reaches the colon intact. In the colon, resident bacteria ferment lactitol into short-chain fatty acids – primarily acetic acid, propionic acid, and butyric acid. This bacterial fermentation produces two important effects: it lowers the pH of the colonic contents and it increases the osmotic pressure within the bowel lumen.
The lowered pH and increased osmotic pressure draw water from the surrounding tissues into the colon, increasing both the volume and water content of the stool. This bulkier, softer stool stimulates peristalsis – the rhythmic contractions of the intestinal muscles that propel contents along the digestive tract. The result is a more natural, comfortable bowel movement without the harsh stimulant effects associated with some other classes of laxatives.
In addition to its role in treating constipation, Importal Ex-Lax has an established use in the management of hepatic encephalopathy. This condition occurs when the liver is severely damaged (as in cirrhosis) and can no longer adequately clear ammonia and other toxins from the blood. The accumulation of ammonia in the bloodstream leads to neuropsychiatric symptoms ranging from mild confusion and mood changes to severe disorientation and coma. When lactitol is given at higher doses, the pronounced acidification of the colonic environment converts ammonia (NH3) into ammonium ions (NH4+), which cannot be reabsorbed through the intestinal wall and are excreted in the faeces. This mechanism effectively reduces blood ammonia levels and alleviates the symptoms of hepatic encephalopathy. Treatment for this condition is carried out exclusively under hospital supervision.
An important clinical advantage of Importal Ex-Lax is that it does not affect blood glucose or insulin levels. Because lactitol is not absorbed from the gastrointestinal tract and is not metabolised systemically, it has no caloric value and does not influence glycaemic control. This makes it a safe and appropriate choice for patients with diabetes mellitus who require laxative therapy.
You should consult your doctor if your symptoms do not improve or if they worsen within a few days of starting treatment.
What Should You Know Before Taking Importal Ex-Lax?
Before taking Importal Ex-Lax, you should be aware of certain contraindications, precautions, and potential interactions. Do not use this medicine if you have galactosaemia, intestinal obstruction, or undiagnosed abdominal pain.
As with any medicine, it is important to understand who should not take Importal Ex-Lax, what precautions apply to specific patient groups, and how it may interact with other medications. The following sections cover these considerations in detail to help you use Importal Ex-Lax safely and effectively.
Contraindications
You must not take Importal Ex-Lax in the following situations:
- Allergy to lactitol monohydrate: If you have a known hypersensitivity to lactitol or any component of the formulation, do not use this product.
- Intestinal obstruction or structural damage: Any blockage in the gastrointestinal tract (mechanical bowel obstruction) or organic damage to the gut wall is an absolute contraindication. Osmotic laxatives could worsen these conditions by increasing intraluminal pressure.
- Undiagnosed abdominal pain or rectal bleeding: These symptoms may indicate a serious underlying condition (such as appendicitis, inflammatory bowel disease, or colorectal malignancy) that requires proper diagnosis before laxative use.
- Galactosaemia: Patients with galactosaemia (an inherited inability to metabolise galactose) must not take lactitol, as it is a galactose derivative and could lead to dangerous accumulation of galactose in the body.
- Hereditary fructose intolerance in nursing infants: If you are breastfeeding a child or infant who has been diagnosed with fructose intolerance, you should not take Importal Ex-Lax.
- Fluid and electrolyte imbalances: Patients with clinically significant dehydration or electrolyte disturbances should not use osmotic laxatives until these imbalances have been corrected.
If you experience severe abdominal pain, vomiting, fever, or rectal bleeding, stop taking Importal Ex-Lax immediately and seek medical attention. These symptoms may indicate a serious condition that requires urgent evaluation.
Warnings and Precautions
Several groups of patients should exercise particular caution when using Importal Ex-Lax:
- Elderly or physically frail patients: If you are elderly or debilitated and require long-term laxative use, your doctor should monitor you regularly. Prolonged use of osmotic laxatives can lead to fluid loss and electrolyte disturbances, particularly hypokalaemia (low potassium), which may in turn cause cardiac arrhythmias and muscular weakness.
- Patients scheduled for colonoscopy or intestinal examination: Inform your doctor that you are using Importal Ex-Lax before undergoing any internal examination of the bowel, as this may affect preparation protocols.
- Nausea: If you experience nausea when taking Importal Ex-Lax, try taking it with a meal to reduce this symptom.
- Patients with ileostomy or colostomy: Importal Ex-Lax is not recommended for patients with a stoma, as the osmotic effect in the colon may not function as intended and could lead to excessive fluid loss.
- Flatulence at treatment start: If you experience significant bloating or gas when starting treatment, begin with a lower dose and gradually increase to the recommended level over several days.
- Persistent constipation: If no improvement occurs after a few days of treatment, or if constipation returns after stopping, consult a doctor. Chronic constipation should be medically evaluated to rule out underlying causes.
- Maximum duration: Do not use Importal Ex-Lax for longer than 2 weeks without medical supervision.
Pregnancy and Breastfeeding
If you are pregnant, planning to become pregnant, or breastfeeding, speak to your doctor or pharmacist before taking Importal Ex-Lax.
Pregnancy: Clinical experience with lactitol in pregnant women is limited. Use during the first trimester of pregnancy is not recommended unless specifically advised by your doctor. The European Medicines Agency (EMA) and international guidelines generally suggest that osmotic laxatives may be considered during pregnancy when dietary and lifestyle measures have failed, but the decision should always involve a healthcare professional who can weigh the benefits against potential risks.
Breastfeeding: It is not known whether lactitol monohydrate passes into breast milk. However, because systemic absorption of lactitol is negligible (less than 2%), it is generally considered compatible with breastfeeding. The World Health Organization considers osmotic laxatives to be among the safer options for lactating women.
Driving and Using Machines
Importal Ex-Lax does not affect your ability to drive or operate machinery. No impairment of alertness, concentration, or reaction time has been observed with lactitol use.
Importal Ex-Lax contains lactitol, a sugar alcohol. If you have been told by your doctor that you have an intolerance to certain sugars, consult your doctor before taking this medicine. However, lactitol has no effect on insulin or blood glucose levels and is considered safe for patients with diabetes.
How Does Importal Ex-Lax Interact with Other Drugs?
Importal Ex-Lax can interact with several types of medication. As an osmotic laxative, it may reduce the absorption of concurrently administered oral medicines by shortening bowel transit time. A minimum 2-hour gap between doses is recommended.
Drug interactions are an important consideration with any laxative, particularly one that alters gastrointestinal transit time and colonic pH. Importal Ex-Lax can affect the absorption and efficacy of other medications in several ways. The accelerated intestinal transit caused by the osmotic effect may reduce the time available for other oral drugs to be absorbed. Additionally, when used at higher doses for hepatic encephalopathy, the colonic acidification produced by lactitol can be counteracted by alkalinising agents.
As a general rule, you should not take Importal Ex-Lax at the same time as other oral medications. After taking any other medicine by mouth, wait at least 2 hours before taking Importal Ex-Lax to ensure adequate absorption of the other drug.
Clinically Significant Interactions
| Drug / Drug Class | Interaction | Clinical Significance |
|---|---|---|
| Antacids (aluminium/magnesium hydroxide) | Antacids raise the colonic pH, counteracting the acidification produced by lactitol. This can significantly reduce the efficacy of lactitol in treating hepatic encephalopathy. | High – Avoid concurrent use when treating hepatic encephalopathy |
| Cardiac glycosides (e.g. digoxin) | Prolonged laxative use may cause hypokalaemia (low potassium), which increases the toxicity of cardiac glycosides and the risk of serious arrhythmias. | High – Monitor potassium levels regularly |
| Thiazide diuretics (e.g. hydrochlorothiazide) | Both thiazides and osmotic laxatives can cause potassium loss. Combined use increases the risk of hypokalaemia, potentially leading to cardiac and neuromuscular complications. | Moderate – Monitor electrolytes |
| Corticosteroids (e.g. prednisolone) | Systemic corticosteroids promote potassium excretion. When combined with an osmotic laxative, the risk of hypokalaemia increases further. | Moderate – Monitor electrolytes |
| Amphotericin B | Amphotericin B is nephrotoxic and can cause significant potassium wasting. Combined use with osmotic laxatives amplifies the risk of dangerous hypokalaemia. | Moderate – Monitor potassium closely |
| Carbenoxolone | Carbenoxolone has mineralocorticoid-like effects that promote sodium retention and potassium loss, increasing the risk of electrolyte imbalances when used with laxatives. | Moderate – Monitor electrolytes |
General Advice on Timing
Because laxatives can reduce the intestinal transit time and potentially decrease the absorption of other orally administered medicines, a general principle applies: do not take Importal Ex-Lax at the same time as other medications. Wait at least 2 hours after taking any other oral medication before taking Importal Ex-Lax. This precaution is particularly important for medicines with a narrow therapeutic index, where small changes in absorption can have significant clinical consequences.
Always inform your doctor or pharmacist about all the medicines you are currently taking, including prescription drugs, over-the-counter products, and herbal supplements. This allows your healthcare provider to assess potential interactions and adjust timing or doses if necessary.
Importal Ex-Lax powder should be mixed with a cold or hot drink (water, tea, coffee, juice) or sprinkled directly onto food. It dissolves easily and has a slightly sweet taste. There are no known food interactions. Drinking additional fluids (1–2 extra glasses) alongside the dose is recommended to support the osmotic effect.
What Is the Correct Dosage of Importal Ex-Lax?
For constipation in adults, the initial dose is 2 sachets (20 g) daily for a few days, then reduced to 1 sachet (10 g) daily as a maintenance dose. The dose must be individually adjusted to achieve one soft bowel movement per day.
The correct dose of Importal Ex-Lax varies depending on the patient’s age, body weight, and the condition being treated. The goal of treatment is to achieve one soft, formed bowel movement per day. The entire daily dose should be taken at one time, preferably in the morning or evening with a meal. An additional 1–2 glasses of fluid should be consumed alongside the dose. The laxative effect usually appears within a few hours of ingestion but may take up to 2–3 days in some individuals.
Adults
Standard Adult Dosage for Constipation
- Initial dose: 2 sachets (20 g of lactitol) per day for the first few days
- Maintenance dose: 1 sachet (10 g of lactitol) per day, or as directed by your doctor
- Timing: Take the full daily dose at once, morning or evening, with a meal
- Preparation: Dissolve the powder in a cold or hot drink, or sprinkle on food
- Fluid intake: Drink an additional 1–2 glasses of water or other liquid
If you experience significant bloating or flatulence at the start of treatment, begin with 1 sachet per day and increase to the full initial dose over several days once your body has adjusted.
Children
Paediatric Dosage for Constipation
Treatment of children under 7 years should only be undertaken on the recommendation of a doctor. Use in children should be supervised by an adult, and it is essential to follow the doctor’s instructions carefully.
The average daily dose for children is 0.25 g per kilogram of body weight.
| Age Group | Daily Dose | Notes |
|---|---|---|
| Under 1 year | As prescribed by doctor only | Must not be used without medical supervision |
| 1–6 years | ¼ to ½ sachet (2.5–5 g) | Only on doctor’s recommendation; supervised by an adult |
| 7–12 years | ½ to 1 sachet (5–10 g) | Adjust based on response; supervised by an adult |
| 13–16 years | 1 to 2 sachets (10–20 g) | Follow adult dosing schedule |
| Adults (17+) | 1–2 sachets (10–20 g) | Start with 2 sachets; reduce to 1 sachet maintenance |
Elderly Patients
There is no specific dose adjustment required for elderly patients. However, older adults and physically frail individuals who use Importal Ex-Lax for long-term management of constipation should have regular medical check-ups. This is because prolonged osmotic laxative use can lead to fluid and electrolyte imbalances, which are particularly hazardous in older adults who may already be at risk of dehydration or potassium depletion due to concurrent medications or reduced fluid intake.
Hepatic Encephalopathy (Hospital Use Only)
When Importal Ex-Lax is used for the treatment of hepatic encephalopathy, the dosage is significantly higher than for constipation and is determined individually by the treating physician. The starting dose for adults is typically 0.5 to 0.7 g per kilogram of body weight per day, divided into three doses. This treatment is exclusively carried out under hospital supervision, with close monitoring of neurological status, ammonia levels, and electrolyte balance.
Missed Dose
If you forget to take a dose of Importal Ex-Lax, simply take your next dose at the usual time. Do not take a double dose to make up for a missed one. Because the laxative effect of lactitol is cumulative rather than immediate, missing a single dose is unlikely to have a significant impact on your treatment.
Overdose
If you take too much Importal Ex-Lax, or if a child accidentally ingests the medicine, contact your doctor, hospital, or poison control centre immediately. Overdose symptoms may include abdominal pain, severe diarrhoea, and electrolyte disturbances. Fluid and electrolyte losses must be replaced. Dehydration can be particularly dangerous in children, elderly patients, and those with kidney disease.
What Are the Side Effects of Importal Ex-Lax?
Like all medicines, Importal Ex-Lax can cause side effects, although not everyone gets them. The most common side effects are gastrointestinal symptoms such as bloating, flatulence, and abdominal discomfort, which typically subside after the first few days of regular use.
Importal Ex-Lax is generally well tolerated. The most frequently reported side effects are related to its mechanism of action in the colon – the bacterial fermentation of lactitol produces gas as a by-product, which can cause bloating, flatulence, and a sensation of fullness. These symptoms are most common at the beginning of treatment and usually diminish as the colonic bacteria adapt to the regular presence of lactitol. Starting with a lower dose and gradually increasing it can help minimise these initial effects.
Some patients may experience diarrhoea at the recommended dosage. This is typically a sign that the dose is slightly too high for the individual and can usually be resolved by reducing the dose. If diarrhoea is persistent or severe, you should consult your doctor, as it may lead to dehydration and electrolyte disturbances if not addressed.
The following side effects have been reported with Importal Ex-Lax, grouped by frequency:
Rare
May affect up to 1 in 1,000 people
- Abdominal pain or cramps
- Abdominal distension (bloating)
- Diarrhoea
- Flatulence (gas)
- Vomiting
Very Rare
May affect up to 1 in 10,000 people
- Nausea
- Abnormal bowel sounds (borborygmi)
- Anal pruritus (itching around the anus)
In more severe cases or with prolonged high-dose use, particularly in elderly or debilitated patients, osmotic laxatives can cause dehydration and electrolyte imbalances. Hypokalaemia (low blood potassium) is the most clinically significant electrolyte disturbance and can lead to muscle weakness, cardiac arrhythmias, and impaired neuromuscular function. This risk is increased in patients concurrently taking cardiac glycosides, diuretics, or corticosteroids.
If you experience bloating, gas, or abdominal discomfort at the start of treatment, try reducing your dose temporarily and then gradually increasing it over several days. Taking Importal Ex-Lax with a meal can also help reduce nausea. These initial effects usually resolve within the first week of regular use as your gut bacteria adapt.
If any of these side effects become severe, or if you notice any effects not listed here, contact your doctor or pharmacist promptly. You can also report suspected side effects through your national pharmacovigilance reporting system.
How Should You Store Importal Ex-Lax?
Store Importal Ex-Lax in the original packaging, out of sight and reach of children, and protect it from moisture. Use before the expiry date printed on the packaging.
Proper storage is essential to maintain the quality and effectiveness of any medicine. Importal Ex-Lax should be stored according to the following guidelines:
- Keep out of sight and reach of children. Store the product in a secure location to prevent accidental ingestion.
- Store in the original packaging. The sachets are designed to protect the powder from moisture, which is particularly important as lactitol is moisture-sensitive and may clump or degrade if exposed to humidity.
- Protect from moisture. Do not remove sachets from the carton until you are ready to use them. Avoid storing in bathrooms or other damp environments.
- Check the expiry date. Do not use the medicine after the expiry date stated on the carton and individual sachets. The expiry date refers to the last day of the stated month.
- Prepared solutions: If you prepare a solution in advance, it should be used within 2 days and stored in a refrigerator at 2–8°C.
Do not dispose of medicines via wastewater or household waste. Ask your pharmacist about how to dispose of medicines that you no longer use. These measures help to protect the environment.
What Does Importal Ex-Lax Contain?
Each sachet of Importal Ex-Lax contains 10 g of lactitol monohydrate as the sole active ingredient. The product contains no other excipients, additives, or preservatives.
Importal Ex-Lax is a remarkably simple formulation containing only one ingredient:
- Active substance: Lactitol monohydrate, 10 g per sachet
- Other ingredients: None – the product contains no additional excipients, preservatives, colourings, or flavourings
Appearance: Importal Ex-Lax is a white, crystalline powder with a slightly sweet taste. Its clean, simple composition makes it well tolerated by most patients, including those with sensitivities to common pharmaceutical excipients.
Packaging: Importal Ex-Lax is available in cartons containing 10, 50, or 100 individual dose sachets. Not all pack sizes may be marketed in all countries.
Manufacturer: Aziende Chimiche Riunite Angelini Francesco A.C.R.A.F. S.p.A., V.le Amelia 70, 00181 Rome, Italy.
Frequently Asked Questions About Importal Ex-Lax
Importal Ex-Lax (lactitol monohydrate) is an osmotic laxative primarily used to treat constipation in adults and children. It works by drawing water into the colon, softening the stool and promoting bowel movements. It is also used in hospital settings as part of the treatment for hepatic encephalopathy, a condition caused by severe liver disease, where it helps reduce blood ammonia levels.
The laxative effect usually appears within a few hours after taking the dose, but in some people it can take up to 2 to 3 days for the full effect to develop. For best results, take the entire daily dose at once with a meal and drink plenty of fluids. Consistency is key – taking it at the same time each day helps establish a regular bowel pattern.
Yes. Lactitol monohydrate is not absorbed from the gastrointestinal tract and has no effect on blood glucose or insulin levels. It is therefore safe and appropriate for patients with both type 1 and type 2 diabetes mellitus. It provides no caloric value and does not require insulin for metabolism.
Children aged 7 and older may use Importal Ex-Lax at age-appropriate doses. Children under 7 should only use it on the specific recommendation of a doctor. The typical paediatric dose is 0.25 g per kilogram of body weight per day. An adult should always supervise the use of this medicine in children.
Experience with lactitol in pregnant women is limited. It is not recommended during the first trimester unless your doctor advises otherwise. During breastfeeding, Importal Ex-Lax is generally considered safe because lactitol is not significantly absorbed into the body and is unlikely to pass into breast milk in meaningful quantities. Always consult your healthcare provider before using any medicine during pregnancy or breastfeeding.
Importal Ex-Lax should not be used for more than 2 weeks without medical supervision. If your constipation does not improve after a few days of treatment, or if it recurs after stopping, you should consult your doctor. Chronic constipation may have underlying causes that require investigation and targeted treatment.
References and Sources
- World Gastroenterology Organisation (WGO). WGO Global Guideline: Constipation – A Global Perspective. 2010 (updated 2023). Available at: worldgastroenterology.org
- European Association for the Study of the Liver (EASL). EASL Clinical Practice Guidelines on the Management of Hepatic Encephalopathy. Journal of Hepatology. 2022;77(3):807–824. doi:10.1016/j.jhep.2022.06.001
- National Institute for Health and Care Excellence (NICE). Constipation in Adults: Diagnosis and Management. Clinical Guideline CG99. 2023. Available at: nice.org.uk
- Blanc P, Daures JP, Rouillon JM, et al. Lactitol or lactulose in the treatment of chronic hepatic encephalopathy: results of a meta-analysis. Hepatology. 1992;15(2):222–228. doi:10.1002/hep.1840150209
- Cammà C, Fiorello F, Tiné F, et al. Lactitol in treatment of chronic hepatic encephalopathy. A meta-analysis. Digestive Diseases and Sciences. 1993;38(5):916–922. doi:10.1007/BF01295920
- European Medicines Agency (EMA). Assessment Report: Lactitol-containing Medicinal Products. EMEA/H/A-31/1470. Available at: ema.europa.eu
- World Health Organization (WHO). WHO Model List of Essential Medicines – 23rd List. 2023. Available at: who.int
- British National Formulary (BNF). Lactitol. Available at: bnf.nice.org.uk
Editorial Team
Medical Review
Written and reviewed by the iMedic Medical Editorial Team – specialists in gastroenterology, hepatology, and clinical pharmacology. All content follows international guidelines (WHO, WGO, NICE, EASL) and the GRADE evidence framework.
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Evidence level 1A based on systematic reviews and meta-analyses of randomised controlled trials. No commercial funding. Independent editorial content with no pharmaceutical company sponsorship.
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