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Dulcolax 5mg Tablets for Constipation

Dulcolax 5mg Tablets for Constipation

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  • ✔️ Relieves occasional constipation within 6 to 12 hours
  • ✔️ Stimulates natural bowel contractions for effective results
  • ✔️ Enteric-coated tablet protects the stomach lining
  • ✔️ Suitable for adults and children aged 4 and over
  • ✔️ Clinically established bisacodyl formula for predictable relief

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Are Dulcolax 5mg Tablets Right for Your Constipation?

 

Constipation is something most people experience at some point — and it can be genuinely uncomfortable. Straining, bloating, and that persistent feeling of being blocked up are no fun at all. Bisacodyl tablets for constipation like Dulcolax 5mg offer a reliable, clinically established option for short-term relief when dietary changes and increased fluid intake haven't done the trick. Available over the counter from Cured Pharmacy for just £2.49, these tablets are a straightforward solution for occasional constipation in adults and children aged 4 and over. If you're also managing related digestive discomfort, you might find our IBS and cramps collection useful alongside this product.

Dulcolax 5mg tablets contain bisacodyl as the active ingredient. Bisacodyl is a well-established stimulant laxative that has been used in the UK for decades. It works locally in the bowel rather than being significantly absorbed into the bloodstream, which is one reason it's considered suitable for short-term use in otherwise healthy adults.

 

How Do Dulcolax 5mg Tablets Work in the Bowel?

 

Bisacodyl works by stimulating the nerve endings in the wall of the large intestine (colon). This triggers muscle contractions — known as peristalsis — that push stool towards the rectum. At the same time, it reduces the amount of water and electrolytes absorbed from the bowel, which helps to soften the stool and make it easier to pass. The tablets are enteric-coated, meaning they dissolve in the intestine rather than the stomach, which reduces the risk of stomach irritation.

  • Stimulates peristaltic contractions in the large intestine
  • Reduces water reabsorption, softening stool consistency
  • Enteric coating protects the stomach lining
  • Typically produces a bowel movement within 6–12 hours

 

Who Is Dulcolax 5mg Suitable For?

 

These tablets are designed for adults and children aged 4 and over who are experiencing occasional constipation. They're particularly useful when you need reliable, predictable relief — for example, before a medical procedure or when constipation has persisted for a couple of days despite lifestyle measures. That said, they're not a long-term solution, and regular use should always be discussed with a healthcare professional.

  • Adults experiencing occasional or short-term constipation
  • Children aged 4 and over (under medical supervision)
  • People preparing for certain bowel examinations or procedures
  • Those who haven't responded to dietary fibre or fluid increases alone

 

How Do Dulcolax Tablets Compare to Other Laxatives?

 

Feature Dulcolax 5mg (Bisacodyl) Lactulose (Osmotic Laxative)
Type of laxative Stimulant Osmotic
Onset of action 6–12 hours 24–48 hours
Suitable for children Aged 4+ (with supervision) All ages (with supervision)
Available OTC in UK Yes Yes

 

How Should You Store Dulcolax 5mg Tablets?

 

Store Dulcolax 5mg tablets below 25°C in a dry place, away from direct sunlight. Keep them in their original packaging and out of reach of children. Do not use the tablets after the expiry date printed on the pack. If you're unsure whether a laxative is appropriate for your situation — particularly if you have an underlying bowel condition — it's always worth browsing our constipation collection for further options and speaking to one of our pharmacists.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Dulcolax 5mg Tablets for Constipation specifications
Treatment category Constipation relief
Mechanism of action Stimulant laxative — stimulates colonic peristalsis and reduces water reabsorption
Effective Within 6–12 hours
Suitable for Adults and children aged 4 and over
Active ingredient Bisacodyl 5mg
Pack sizes Various (typically 20–40 tablets)
Strengths 5mg per tablet
UK classification General Sale List (GSL) / Pharmacy (P) medicine
Drug class Stimulant laxative
Preparation Enteric-coated tablet
Route of administration Oral

Specifications of Dulcolax 5mg Tablets for Constipation

 

What Are Dulcolax 5mg Tablets and What Are They Used For?

 

Dulcolax 5mg tablets contain bisacodyl, a stimulant laxative used to treat occasional constipation in adults and children aged 4 and over. Constipation is defined as passing fewer than three stools per week, or passing stools that are hard, dry, and difficult to pass. According to the NHS, constipation is very common and affects people of all ages — it's usually not serious, but it can be uncomfortable and disruptive to daily life. Dulcolax tablets are intended for short-term use only and should not replace dietary and lifestyle measures such as increasing fibre intake, drinking more fluids, and staying physically active.

 

What Do You Need to Know Before Using Dulcolax 5mg Tablets?

 

Before taking these tablets, it's important to check whether they're appropriate for you. Do not use Dulcolax 5mg tablets if any of the following apply:

  • You are allergic to bisacodyl or any other ingredient in the tablets
  • You have a bowel obstruction or ileus (paralytic bowel)
  • You have severe dehydration
  • You have acute inflammatory bowel conditions such as Crohn's disease or ulcerative colitis (during a flare)
  • You have appendicitis or unexplained abdominal pain
  • You are under 4 years of age
  • You are pregnant or breastfeeding (seek medical advice first)

The following medicines may interact with bisacodyl tablets:

  • Antacids and milk — can dissolve the enteric coating prematurely, causing stomach irritation; leave at least one hour between taking antacids or dairy and your Dulcolax tablet
  • Diuretics and corticosteroids — concurrent use may increase the risk of electrolyte imbalance, particularly low potassium
  • Digoxin and other cardiac glycosides — electrolyte disturbances caused by laxative overuse may affect how these medicines work

 

How Should You Use Dulcolax 5mg Tablets Correctly?

 

Always follow the instructions in the patient information leaflet or as directed by your pharmacist. Swallow the tablets whole with a glass of water — do not chew or crush them, as this will damage the enteric coating. Do not take them within one hour of consuming milk or antacids.

  1. Take the tablet(s) whole with a full glass of water
  2. Do not chew, break, or crush the tablet
  3. Avoid milk, dairy products, and antacids for at least one hour before and after taking the tablet
  4. Take at bedtime for a bowel movement the following morning
  5. Do not exceed the recommended dose
  6. Do not use for more than 5 consecutive days without medical advice
Age Group Dose Frequency Notes
Adults and children aged 10+ 1–2 tablets (5–10mg) Once daily at night Do not exceed 2 tablets per day
Children aged 4–10 1 tablet (5mg) Once daily at night Under medical supervision only
Under 4 years Not recommended Do not use

 

What Are the Possible Side Effects of Dulcolax 5mg Tablets?

 

Like all medicines, bisacodyl tablets can cause side effects, although not everyone experiences them. Most side effects are mild and related to the way the medicine works in the bowel. If you're also managing other digestive symptoms, you may find it helpful to explore our diarrhoea collection should loose stools become a concern.

Common side effects (may affect up to 1 in 10 people):

  • Abdominal cramps or discomfort
  • Diarrhoea
  • Nausea
  • Abdominal pain

Less common side effects (may affect up to 1 in 100 people):

  • Dizziness or feeling faint (particularly when standing up quickly)
  • Rectal irritation or burning sensation
  • Electrolyte imbalance with prolonged use (e.g. low potassium)
  • Allergic reactions — rash, itching, or swelling (seek medical attention immediately)

 

How Should You Store Dulcolax 5mg Tablets Safely?

 

  • Store below 25°C in a dry place away from direct heat and sunlight
  • Keep in the original packaging to protect from moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the pack
  • Do not dispose of medicines via wastewater or household waste — return unused medicines to your pharmacy

If you're looking for broader digestive health support, our IBS and cramps collection includes a range of products that may complement your bowel health routine.

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Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Dulcolax 5mg tablets online in the UK?

You can buy Dulcolax 5mg tablets directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. No prescription is needed as these are available over the counter. Simply add them to your basket and they'll be dispatched quickly to your address. Browse our full constipation collection for more options.

How do bisacodyl tablets work in the body?

Bisacodyl is a stimulant laxative that acts directly on the nerve endings in the wall of the large intestine, triggering muscle contractions that push stool towards the rectum. It also reduces water reabsorption in the bowel, which softens the stool and makes it easier to pass. The enteric coating means the tablet dissolves in the intestine rather than the stomach, reducing the chance of irritation.

How long do Dulcolax 5mg tablets take to work?

Dulcolax 5mg tablets typically produce a bowel movement within 6 to 12 hours of taking them. Most people take them at bedtime so the effect occurs the following morning. If you haven't had a bowel movement within 12 hours, do not take an additional dose without speaking to a pharmacist first.

What is the correct dose of Dulcolax 5mg for adults?

The recommended adult dose is 1 to 2 tablets (5mg to 10mg) taken once at night. You should not exceed 2 tablets in any 24-hour period. Do not use for more than 5 consecutive days without seeking advice from your doctor or pharmacist, as prolonged use can lead to dependence and electrolyte imbalance.

What is the best time to take Dulcolax 5mg tablets?

The best time to take Dulcolax 5mg tablets is at bedtime, as this allows the medicine to work overnight and produce a bowel movement in the morning. Avoid taking them with milk, dairy products, or antacids — leave at least one hour between these and your tablet to protect the enteric coating. Taking them at a consistent time each night can help you predict when the effect will occur.

Can I take Dulcolax tablets during pregnancy?

Bisacodyl is not generally recommended during pregnancy, especially in the first trimester, without specific medical advice. If you are pregnant and struggling with constipation, speak to your GP or midwife before using any laxative. They may suggest safer alternatives such as dietary changes or a bulk-forming laxative like ispaghula husk.

Can children take Dulcolax 5mg tablets?

Dulcolax 5mg tablets can be used in children aged 4 and over, but only under the supervision of a doctor. Children aged 4 to 10 should take just 1 tablet (5mg) once at night. Children under 4 should not take these tablets. Always consult a GP before giving any laxative to a child.

How do I manage side effects of Dulcolax 5mg tablets?

The most common side effects — abdominal cramps, nausea, and loose stools — are usually mild and short-lived. Staying well hydrated can help reduce discomfort. If you experience severe cramping, persistent diarrhoea, or signs of an allergic reaction such as rash or swelling, stop taking the tablets and contact your pharmacist or GP promptly.

What happens if I miss a dose of Dulcolax 5mg?

If you forget to take your tablet at bedtime, simply take it the following night as usual — do not double up to make up for a missed dose. Because Dulcolax is used on an as-needed basis for occasional constipation rather than as a daily scheduled medicine, missing a single dose is not usually a concern. If constipation persists despite use, speak to your pharmacist.

What are the alternatives to Dulcolax tablets for constipation?

There are several types of laxative available in the UK, including osmotic laxatives (such as lactulose or macrogol), bulk-forming laxatives (such as ispaghula husk), and stool softeners (such as docusate sodium). The right choice depends on the cause and duration of your constipation. Browse our constipation collection to compare options, or speak to a pharmacist for personalised advice.

How long can you use Dulcolax 5mg tablets for?

Dulcolax 5mg tablets are intended for short-term use only — no more than 5 consecutive days. Using stimulant laxatives for longer than this without medical supervision can lead to your bowel becoming reliant on them to function, a condition sometimes called laxative dependence. If constipation is ongoing or recurring, speak to your GP to identify any underlying cause.

Can I take Dulcolax tablets with other medicines?

You should avoid taking Dulcolax tablets within one hour of antacids or milk, as these can dissolve the enteric coating and cause stomach irritation. If you take diuretics, corticosteroids, or heart medicines such as digoxin, speak to your pharmacist before using bisacodyl, as electrolyte changes caused by laxatives can affect how these medicines work. Always tell your pharmacist about all medicines you are currently taking.

Is Dulcolax 5mg suitable for people with IBS?

Stimulant laxatives like bisacodyl are not usually the first choice for people with irritable bowel syndrome (IBS), as they can sometimes worsen cramping and unpredictable bowel habits. If you have IBS and are experiencing constipation, it's worth exploring our IBS and cramps collection for more targeted options. Always discuss laxative use with your GP if you have a diagnosed bowel condition.

Who should not take Dulcolax 5mg tablets?

You should not take Dulcolax 5mg tablets if you have a bowel obstruction, severe dehydration, acute inflammatory bowel disease, appendicitis, or unexplained abdominal pain. They are also not suitable for children under 4, and should only be used in pregnancy or breastfeeding under medical guidance. If you are unsure whether this product is right for you, speak to your pharmacist before purchasing.

What are the latest findings on bisacodyl for constipation?

Bisacodyl remains one of the most widely studied and clinically validated stimulant laxatives available in the UK. Published clinical evidence consistently supports its efficacy for short-term relief of constipation in adults, with a well-established safety profile when used as directed. The NHS and BNF continue to list bisacodyl as a recommended option for occasional constipation, and no significant new safety concerns have emerged in recent years for short-term use.

How Should You Use Dulcolax 5mg Tablets?

Dulcolax 5mg tablets should be swallowed whole with a full glass of water. Do not chew, crush, or break the tablets, as this damages the enteric coating that protects your stomach and ensures the medicine is released in the right part of your digestive system. Avoid taking them with milk, dairy products, or antacids — wait at least one hour before or after consuming these.

What Is the Correct Dose of Dulcolax 5mg Tablets?

The dose varies depending on age. Always follow the dosage instructions in the patient information leaflet or as directed by your pharmacist. Never exceed the stated dose, and do not use for more than 5 consecutive days without medical advice.

When Is the Best Time to Use Dulcolax 5mg Tablets?

The most effective time to take Dulcolax 5mg tablets is at bedtime. Because bisacodyl typically takes 6 to 12 hours to produce a bowel movement, taking it at night means you're likely to experience the effect the following morning — which fits naturally into most people's routines. Consistency matters: try to take the tablet at the same time each evening if you're using it on consecutive nights.

How Long Can You Use Dulcolax 5mg Tablets For?

Dulcolax 5mg tablets are intended for short-term use only. You should not use them for more than 5 consecutive days without speaking to a doctor or pharmacist. Prolonged or excessive use of stimulant laxatives can lead to electrolyte imbalances, bowel dependence, and reduced natural bowel function over time. If constipation is persistent or keeps returning, it's important to speak to your GP to rule out an underlying cause rather than continuing to rely on laxatives.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Dulcolax 5mg Tablets?

Most people tolerate Dulcolax 5mg tablets well when used as directed, but some side effects can occur. The most common ones are directly related to how the medicine stimulates the bowel. They are usually mild and resolve on their own once the medicine has worked.

  • Abdominal cramps or discomfort
  • Diarrhoea
  • Nausea
  • Abdominal pain or bloating

What Are the Less Common Side Effects of Dulcolax 5mg Tablets?

Less commonly, some people may experience side effects that are worth being aware of, particularly if you are using the tablets more frequently or at higher doses than recommended. These are less likely to occur with short-term, appropriate use.

  • Dizziness or light-headedness, especially when standing up quickly
  • Rectal irritation or a burning sensation after a bowel movement
  • Electrolyte disturbances (such as low potassium) with prolonged use
  • Vomiting

What Are the Serious Side Effects of Dulcolax 5mg Tablets?

Serious side effects are rare but can occur. Signs of a serious allergic reaction include swelling of the face, lips, tongue, or throat, difficulty breathing, or a widespread skin rash. These require immediate medical attention — call 999 or go to your nearest A&E. Severe electrolyte imbalance from overuse can cause muscle weakness, irregular heartbeat, or extreme fatigue, and should be assessed by a doctor promptly.

What Should You Do If You Experience Side Effects?

If you experience mild side effects such as cramping or loose stools, these usually settle within a few hours. Staying well hydrated is important. If side effects are severe, persistent, or worrying — or if you experience any signs of an allergic reaction — stop taking the tablets immediately and contact your pharmacist or GP. Do not take additional doses to try to counteract side effects.

Can Dulcolax 5mg Tablets Interact With Other Medicines?

Yes, bisacodyl can interact with certain medicines. Antacids and milk can break down the enteric coating if taken within one hour of the tablet, causing stomach irritation. If you take diuretics, corticosteroids, or heart medicines such as digoxin, the electrolyte changes caused by laxative use may affect how those medicines work. Always inform your pharmacist of all medicines, supplements, and herbal remedies you are taking before starting Dulcolax tablets.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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