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Dulcolax 5mg Bisacodyl - 100 Tablets

Dulcolax 5mg Bisacodyl - 100 Tablets

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  • ✔️ Relieves occasional constipation within 6 to 12 hours
  • ✔️ Stimulates bowel muscle contractions for effective stool movement
  • ✔️ Enteric-coated tablets protect stomach lining during action
  • ✔️ Suitable for adults and children aged 4 and over
  • ✔️ 100-tablet pack provides excellent value for ongoing use

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What Are Dulcolax Bisacodyl 5mg Tablets Used For?

 

Constipation is something most people experience at some point — and it can be genuinely uncomfortable. Bisacodyl 5mg tablets are a well-established, over-the-counter stimulant laxative used for the short-term relief of occasional constipation in adults and children aged 4 and over. Each Dulcolax tablet contains 5mg of bisacodyl as the active ingredient, and this 100-tablet pack offers excellent value for households that want a reliable supply on hand. You can browse our full range of constipation treatments if you'd like to compare options before deciding.

Constipation is defined by the NHS as passing fewer than three stools per week, or stools that are hard, dry, and difficult to pass. It affects people of all ages and can be triggered by a low-fibre diet, dehydration, reduced physical activity, or certain medicines. Dulcolax bisacodyl tablets are designed to provide reliable, predictable relief — typically within 6 to 12 hours of taking a dose.

 

How Do Dulcolax Bisacodyl Tablets Work?

 

Bisacodyl belongs to a class of medicines called stimulant laxatives. It works directly on the lining of the large intestine (colon) to encourage bowel movement. Here's what happens after you swallow a tablet:

  • The enteric coating protects the tablet from dissolving in the stomach, allowing it to reach the colon intact.
  • Once in the colon, bisacodyl stimulates the nerve endings in the bowel wall, triggering muscle contractions (peristalsis).
  • It also reduces the amount of water and electrolytes absorbed from the colon, which softens the stool.
  • The combined effect moves stool through the bowel more efficiently, resulting in a bowel movement.

Because the tablet is enteric-coated, it's important not to crush or chew it. You should also avoid taking it within one hour of drinking milk or taking antacids, as these can dissolve the coating prematurely and cause stomach irritation.

 

Who Is Dulcolax Bisacodyl Suitable For?

 

This product is suitable for a wide range of people dealing with occasional constipation. It's particularly useful when dietary changes alone haven't been enough, or when you need reliable relief within a set timeframe — for example, before a medical procedure or after surgery.

  • Adults aged 18 and over experiencing occasional constipation
  • Children aged 4 to 17 years (under medical supervision or pharmacist guidance)
  • People who need short-term relief while adjusting their diet or fluid intake
  • Patients preparing for certain medical procedures requiring bowel clearance

It is not suitable for people with bowel obstruction, inflammatory bowel conditions such as Crohn's disease or ulcerative colitis, or those with severe abdominal pain of unknown cause. Always check with your pharmacist if you're unsure.

 

How Does Dulcolax Compare to Other Laxatives?

 

Feature Dulcolax 5mg Bisacodyl Tablets Lactulose (Osmotic Laxative)
Type of laxative Stimulant Osmotic
Onset of action 6–12 hours 24–48 hours
Suitable for children Yes (aged 4+) Yes (all ages)
Available OTC Yes Yes

 

How Should You Store Dulcolax Bisacodyl Tablets?

 

Store bisacodyl 5mg tablets below 25°C in a dry place, away from direct sunlight. Keep the pack out of reach and sight of children at all times. Do not use the tablets after the expiry date printed on the packaging. If you're also managing other digestive concerns, you might find our IBS and cramps collection helpful for additional support products.

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 Bisacodyl 100 Tablets specifications
Treatment category Constipation relief
Mechanism of action Stimulant laxative — stimulates colonic peristalsis and reduces water absorption
Effective Within 6–12 hours
Suitable for Adults and children aged 4 and over
Active ingredient Bisacodyl 5mg
Pack sizes 100 tablets
Strengths 5mg per tablet
UK classification General Sale List (GSL)
Drug class Stimulant laxative
Preparation Enteric-coated tablet
Route of administration Oral

Specifications of Dulcolax 5mg Bisacodyl 100 Tablets

 

What Is Dulcolax Bisacodyl and What Is It Used For?

 

Dulcolax 5mg Bisacodyl Tablets contain bisacodyl, a stimulant laxative used for the short-term relief of occasional constipation. Each tablet is enteric-coated to ensure the active ingredient reaches the colon without being broken down in the stomach. The medicine is available over the counter and does not require a prescription for adults or children aged 4 and over. It is one of the most widely used laxatives in the UK and is listed in the British National Formulary (BNF) as a first-line stimulant laxative option.

 

What Do You Need to Know Before Using Dulcolax Bisacodyl Tablets?

 

Before taking bisacodyl 5mg tablets, it's important to check whether this medicine is right for you. Do not use this product if any of the following apply:

  • You have a known bowel obstruction or ileus
  • You have been diagnosed with inflammatory bowel disease (e.g. Crohn's disease or ulcerative colitis)
  • You have severe abdominal pain, nausea, or vomiting of unknown cause
  • You are severely dehydrated
  • You are allergic to bisacodyl or any of the tablet's excipients
  • The patient is a child under 4 years of age

The following medicines and substances may interact with bisacodyl. Always tell your pharmacist about everything you are taking:

  • Antacids — can dissolve the enteric coating if taken within 1 hour of bisacodyl
  • Milk or dairy products — same risk of premature coating dissolution
  • Diuretics and corticosteroids — concurrent use may increase the risk of electrolyte imbalance
  • Other laxatives — combining stimulant laxatives increases the risk of diarrhoea and dehydration

 

How Should You Use Dulcolax Bisacodyl Tablets?

 

Always use this medicine exactly as described in the patient information leaflet or as directed by your pharmacist. Swallow the tablets whole with a glass of water — do not crush, chew, or break them. Avoid taking them with milk or antacids.

  1. Take the tablet(s) with a full glass of water.
  2. Swallow whole — do not crush or chew.
  3. Do not take within 1 hour of consuming milk, dairy, or antacids.
  4. Take at bedtime for a bowel movement the following morning.
  5. Do not take more than the recommended dose in any 24-hour period.
Age Group Dose Frequency Max Duration
Adults (18+) 1–2 tablets (5–10mg) Once daily at bedtime 5 consecutive days
Children (4–17 years) 1 tablet (5mg) Once daily at bedtime 5 consecutive days
Children under 4 Not recommended

 

What Are the Possible Side Effects of Dulcolax Bisacodyl Tablets?

 

Like all medicines, bisacodyl can cause side effects, although not everyone experiences them. If you're also managing related digestive discomfort, our haemorrhoids and piles collection may offer additional relief products worth considering.

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

  • Abdominal cramps or pain
  • Diarrhoea
  • Nausea
  • Discomfort in the rectum

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

  • Dizziness or fainting (particularly when standing up quickly)
  • Electrolyte imbalance with prolonged use (e.g. low potassium)
  • Allergic reactions such as skin rash or itching
  • Blood in stools — stop use immediately and seek medical advice if this occurs

 

How Should You Store Dulcolax Bisacodyl Tablets?

 

Correct storage helps maintain the effectiveness of the tablets throughout their shelf life. If you're ordering other health products alongside this one, our vitamins and supplements range is worth exploring for general digestive and gut health support.

  • Store below 25°C in a dry place
  • Keep away from direct sunlight and moisture
  • Keep out of reach and sight 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 tablets to your pharmacy

Written and reviewed by our qualified team

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 bisacodyl tablets online in the UK?

You can buy Dulcolax 5mg bisacodyl tablets online directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. No prescription is required as bisacodyl is available over the counter for adults and children aged 4 and over. Simply add the 100-tablet pack to your basket and complete your order for fast UK delivery.

How do bisacodyl 5mg tablets work in the body?

Bisacodyl is a stimulant laxative that acts directly on the nerve endings in the wall of the large bowel, triggering muscle contractions that push stool along. It also reduces water reabsorption in the colon, which softens the stool and makes it easier to pass. The enteric coating ensures the tablet reaches the colon intact rather than dissolving in the stomach.

How long do bisacodyl tablets take to work?

Bisacodyl tablets typically produce a bowel movement within 6 to 12 hours of taking them. Most people take them at bedtime so that the effect occurs the following morning. If no bowel movement occurs within 12 hours, do not take an additional dose without speaking to your pharmacist first.

What is the correct dose of Dulcolax bisacodyl tablets for adults?

The standard adult dose is 1 to 2 tablets (5mg to 10mg) taken once daily, usually at bedtime. You should not exceed 2 tablets in any 24-hour period. If you are unsure about the right dose for your situation, speak to your pharmacist before starting treatment.

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

The best time to take bisacodyl tablets is at bedtime, as this allows the medicine to work overnight and produce a bowel movement in the morning. Avoid taking them within one hour of consuming milk, dairy products, or antacids, as these can interfere with the enteric coating. Taking them with a full glass of water helps the tablet travel smoothly to the colon.

Can children take Dulcolax bisacodyl 5mg tablets?

Yes, bisacodyl 5mg tablets can be used in children aged 4 and over, but the dose is lower — one tablet (5mg) once daily at bedtime. Children under 4 years should not use bisacodyl tablets. It is always advisable to consult a pharmacist or GP before giving any laxative to a child, particularly for recurring constipation.

Can I take Dulcolax bisacodyl tablets during pregnancy?

Bisacodyl is not generally recommended during pregnancy without medical advice. The NHS advises that certain laxatives — particularly bulk-forming types — are preferred during pregnancy. If you are pregnant and experiencing constipation, speak to your GP or midwife before using bisacodyl or any other laxative.

What are the common side effects of bisacodyl 5mg tablets?

The most common side effects include abdominal cramps, diarrhoea, nausea, and rectal discomfort. These are usually mild and resolve once the bowel movement has occurred. If side effects are severe, persistent, or you notice blood in your stools, stop taking the tablets and seek medical advice promptly.

How do I manage side effects of bisacodyl tablets?

Mild abdominal cramps are normal and usually pass once your bowel has moved. Staying well hydrated helps reduce the risk of dehydration, particularly if diarrhoea occurs. If cramping is severe or you feel faint, lie down and contact your pharmacist — and consider whether a gentler laxative from our constipation range might be more suitable for you.

How long can you take bisacodyl tablets for?

Bisacodyl tablets are intended for short-term use only — no more than 5 consecutive days. Using stimulant laxatives for longer than recommended can lead to dependence, electrolyte imbalances, and reduced bowel function over time. If constipation persists beyond 5 days, you should consult your GP to rule out an underlying cause.

What happens if I miss a dose of bisacodyl tablets?

If you forget to take a dose, simply take it the next evening at your usual time. Do not take a double dose to make up for a missed one. Because bisacodyl is used on an as-needed basis for short-term constipation, missing a single dose is unlikely to cause any problems.

Who should not take bisacodyl 5mg tablets?

Bisacodyl is not suitable for people with bowel obstruction, inflammatory bowel disease (such as Crohn's disease or ulcerative colitis), severe abdominal pain of unknown cause, or severe dehydration. It should also not be used in children under 4 years of age. Always check with your pharmacist if you have any existing health conditions before starting treatment.

What are the alternatives to Dulcolax bisacodyl tablets?

There are several types of laxative available depending on your needs. Bulk-forming laxatives such as ispaghula husk (Fybogel) are often recommended first, while osmotic laxatives like macrogol (Movicol) or lactulose are also widely used. You can explore the full range of options in our constipation treatments collection to find the most suitable product for you.

Can bisacodyl tablets interact with other medicines?

Yes, bisacodyl can interact with certain medicines and substances. Antacids and milk can dissolve the enteric coating prematurely if taken within one hour of bisacodyl, causing stomach irritation. Diuretics and corticosteroids taken alongside bisacodyl may increase the risk of electrolyte imbalance. Always inform your pharmacist of all medicines and supplements you are taking.

What are the latest studies on bisacodyl for constipation?

Bisacodyl has been used clinically for decades and remains a well-evidenced option for short-term constipation relief. A 2012 randomised controlled trial published in the Lancet Gastroenterology literature confirmed bisacodyl's efficacy and tolerability in chronic constipation. Current NHS and BNF guidance continues to support its use as a short-term stimulant laxative in appropriate patients.

How Should You Use Dulcolax Bisacodyl Tablets?

Swallow each tablet whole with a full glass of water — never crush, break, or chew them, as this damages the enteric coating and can cause stomach irritation. Avoid taking bisacodyl within one hour of drinking milk, eating dairy products, or taking antacids.

Follow these steps each time you take a dose:

What Is the Correct Dose of Dulcolax Bisacodyl Tablets?

The dose varies depending on age. Always use the lowest effective dose and do not exceed the maximum stated below. If you are unsure which dose applies to you, ask your pharmacist before starting.

When Is the Best Time to Use Dulcolax Bisacodyl Tablets?

Bisacodyl tablets work within 6 to 12 hours, so taking them at bedtime is the most practical approach — you can expect a bowel movement the following morning. This timing also means any mild cramping that occurs is less likely to disrupt your daily activities.

Try to take the tablet at roughly the same time each evening if you are using it on consecutive days. Consistency helps your body respond predictably, and it makes it easier to track how many days you have been using the medicine.

How Long Can You Use Dulcolax Bisacodyl Tablets For?

Bisacodyl tablets are intended for short-term use only. Do not use them for more than 5 consecutive days without seeking advice from your GP or pharmacist. Prolonged use of stimulant laxatives can lead to electrolyte imbalances, reduced bowel muscle tone, and a reliance on laxatives to achieve a bowel movement.

If constipation is a recurring problem, speak to your GP about longer-term management strategies, including dietary changes, increased fluid intake, and regular physical activity. These lifestyle measures are the foundation of good bowel health and should always be tried alongside any short-term laxative use.

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

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Never received andstikl haven’t been refundedd

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Followed the instructions..job done

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What Are the Most Common Side Effects of Dulcolax Bisacodyl Tablets?

Most people tolerate bisacodyl well when used as directed, but some side effects can occur. The most common ones are related to the medicine's action on the bowel and are usually mild and short-lived.

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

What Are the Less Common Side Effects of Dulcolax Bisacodyl Tablets?

Less common side effects affect a smaller number of people and are more likely to occur with higher doses or prolonged use. If you notice any of the following, reduce your dose or stop taking the tablets and speak to your pharmacist.

  • Dizziness or light-headedness, particularly when standing up quickly
  • Electrolyte imbalance (e.g. low potassium or sodium) — more likely with extended use
  • Skin rash, itching, or hives (possible allergic reaction)
  • Vomiting
  • Swelling of the face, lips, or throat (rare — seek emergency help immediately)

What Are the Serious Side Effects of Dulcolax Bisacodyl Tablets?

Serious side effects are rare but require prompt medical attention. Stop taking bisacodyl immediately and contact your GP or call 111 if you experience any of the following:

  • Blood in your stools or rectal bleeding
  • Severe or worsening abdominal pain
  • Signs of a severe allergic reaction — difficulty breathing, swelling of the face or throat, rapid heartbeat
  • Persistent vomiting or inability to keep fluids down

What Should You Do If You Experience Side Effects of Bisacodyl?

Mild cramping and loose stools are expected effects of a stimulant laxative and usually resolve once your bowel has moved. Staying well hydrated is important — drink plenty of water throughout the day, especially if diarrhoea occurs. If side effects are severe, do not take another dose and seek advice from your pharmacist or GP before continuing treatment.

You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps regulators monitor the safety of medicines in real-world use.

Can Dulcolax Bisacodyl Tablets Interact With Other Medicines?

Yes. Bisacodyl has a small number of clinically relevant interactions that are worth being aware of. Antacids and milk can dissolve the enteric coating prematurely if consumed within one hour of taking bisacodyl, leading to stomach irritation rather than colonic action. Taking bisacodyl alongside diuretics (water tablets) or corticosteroids may increase the risk of electrolyte disturbances, particularly low potassium levels. Combining bisacodyl with other laxatives is not recommended without medical advice, as this increases the risk of diarrhoea and dehydration. Always tell your pharmacist about all medicines, supplements, and herbal remedies you are taking before starting bisacodyl.

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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