Dulcolax Tablets

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Dulcolax tablets are a highly effective, over-the-counter stimulant laxative used to treat the uncomfortable symptoms of occasional constipation. Containing 5mg of the active ingredient bisacodyl, each Dulcolax tablet provides predictable overnight relief by gently stimulating the bowel muscles to help your body pass a stool.

Constipation can lead to severe bloating, stomach ache, trapped wind, and cramps. Treating it quickly and efficiently with Dulcolax helps get your digestive system moving so you can feel comfortable and back to normal the very next day.

  • Clinically proven to treat occasional constipation
  • Provides predictable overnight relief (6 to 12 hours)
  • Gently increases the movement of the intestine
  • Relieves uncomfortable bloating and trapped wind
  • Fast, tracked delivery directly to your door
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A Doctor's Overview

Dr Shane Charles (MBBS, MRCS, PgDip SEM) - GMC Number 8085739

GP and surgeon, Dr Shane Charles (MBBS, MRCS, PgDip SEM) provides a simple explanation of the medication below:

'Dulcolax Tablets are used to give relief for constipation symptoms.'

If you think this is a treatment that can help you, complete a quick online questionnaire for our partner pharmacy team to review. If the treatment is deemed suitable, we can safely dispense and deliver it to you from the comfort of your own home with a range of convenient delivery and payment options for you to choose from. If you have any questions about a medication, you should always consult your doctor or pharmacist prior to starting treatment to ensure that it is safe and suitable for you.

Medication Overview
Type of drugStimulant laxative
Health conditions treatedOccasional constipation
Active IngredientBisacodyl
Available strength5mg
Estimated time to work6 to 12 hours (overnight relief)
Available asGastro-resistant tablets

Dulcolax tablets are an effective over-the-counter medicine used to treat constipation and relieve the painful discomfort associated with a blocked bowel[5]. Supplied as small, easy-to-swallow gastro-resistant tablets, this treatment is designed to safely bypass the stomach and activate directly in the colon to provide reliable, overnight relief.

Dulcolax works by releasing its active ingredient, bisacodyl, directly into your lower bowel to encourage a natural bowel movement[1]. As a clinically proven stimulant laxative[3], it actively increases the natural muscle contractions of your digestive system, gently encouraging your body to move waste through the colon and successfully pass a stool.

The primary benefit of taking Dulcolax tablets is gaining fast, predictable relief from the uncomfortable and often painful symptoms of constipation. While occasional constipation is rarely dangerous, it frequently leads to severe bloating, stomach ache, trapped wind, and abdominal cramps. By treating the blockage efficiently with Dulcolax overnight, you can wake up feeling comfortable and back to your normal self.

Understanding how your digestive system works can help you manage your symptoms better. Watch the short video below to see exactly how Dulcolax targets the source of constipation to provide effective overnight relief:

Usage & Dosage Advice

You must swallow the Dulcolax tablet whole with a glass of water, and you can take it either with or without food. Because these are gastro-resistant tablets specially designed to protect your stomach, you must not crush or chew them before swallowing. Crucially, do not take the tablets with milk, and do not consume dairy, antacids, or indigestion remedies within one hour before or after taking the medication. Doing so will dissolve the tablet's protective coating too early and cause severe stomach cramps.

Each Dulcolax tablet contains exactly 5mg of the active laxative bisacodyl. The recommended dose for adults is 1 or 2 tablets taken daily, just before bedtime[4].

ScenarioRecommended Action
Standard Daily DoseTake 1 to 2 tablets before bedtime. If you have not taken Dulcolax before, start with 1 tablet and increase to 2 the next day only if required.
If you take too much (Overdose)Stop taking the medication immediately. You may experience severe diarrhoea and subsequent dehydration. Drink plenty of water and contact a doctor if you are worried.

Side Effects, Warnings & Precautions

When taking Dulcolax, some people report feeling dizzy or faint during bowel movements. If this happens to you, do not drive or operate machinery, and contact a doctor if the feeling persists. You should cease using Dulcolax immediately and contact a medical professional if you experience any serious side effects or notice signs of a severe allergic reaction.

Common side effects include:

  • Abdominal cramps, discomfort, or pain.
  • Diarrhoea.
  • Feeling sick (nausea) or being sick (vomiting).
  • Blood in the stools.

A pharmacist's overview of the side effects:

Dania Al-Zarrad - Senior Specialist Pharmacist – Gastroenterology & Research - GPhC Number 2220980

Senior Specialist Pharmacist, Dania Al-Zarrad, provides a simple explanation of the common side effects of the medication and how you can manage them:

'Often causes abdominal cramps and diarrhoea, with electrolyte imbalance possible with prolonged use; use short term, avoid in dehydration and maintain fluid intake.'

Before taking this medication, you must always check that it is suitable for your current medical conditions. Do not take Dulcolax if:

  • You are allergic (hypersensitive) to bisacodyl or any of the other ingredients in the product.
  • You are intolerant to or cannot digest some sugars, as the tablet contains a small amount of lactose and sucrose.
  • You have severe bodily dehydration.
  • You have a bowel condition called an “ileus” (a blockage in the intestine) or a structurally blocked bowel (intestinal obstruction).
  • You have a serious abdominal condition requiring surgery, such as appendicitis.
  • You have severe, undiagnosed abdominal pain accompanied by nausea and vomiting.
  • You have inflammation of the bowel (small or large intestine).

Because of the way medications interact with each other, you should consult with a doctor or pharmacist before taking Dulcolax tablets if you are already taking any of the following treatments:

Type of TreatmentSpecific Medicines & Advice
Water tablets (Diuretics)Such as bendrofluazide or furosemide (frusemide). Can exacerbate dehydration and electrolyte imbalance.
Steroid medicinesSuch as prednisolone. May interact and cause a dangerous loss of essential bodily salts.
Other laxative medicinesDo not mix laxatives to avoid dangerous over-stimulation of the bowel and severe cramps.

What is the difference between a Dulcolax tablet and Senna?

Both are effective stimulant laxatives, but they use different active ingredients. A Dulcolax tablet uses bisacodyl, which is a synthetic compound that activates directly in the colon. Senna is a natural plant extract that stimulates the bowel. Some people find they respond better to one over the other depending on their specific digestive system.

Can I drink alcohol while taking Dulcolax tablets?

It is highly recommended that you avoid drinking alcohol while taking Dulcolax tablets. Alcohol is a diuretic, meaning it actively dehydrates your body. Since constipation is often caused or worsened by a lack of water in the bowel, drinking alcohol will counteract the medication and make it harder to pass a stool.

Is it safe to use Dulcolax for weight loss?

No, it is extremely dangerous to use any laxative for weight loss. Dulcolax does not prevent your body from absorbing calories; it only removes water and waste from the lower bowel. Misusing laxatives in this way can lead to severe dehydration, organ damage, and dangerous electrolyte imbalances.

Can I take Dulcolax if I am pregnant or breastfeeding?

You should generally avoid taking Dulcolax if you are pregnant or breastfeeding unless specifically instructed to do so by your doctor or midwife. Constipation is very common during pregnancy, but your healthcare provider will usually recommend safer, dietary-based alternatives first.

You can safely buy Dulcolax online in the UK directly from UK Meds without the need for a prior prescription or a medical consultation. However, you must always adhere strictly to the advice given in the enclosed patient leaflet[2]. Simply add the treatment to your basket and complete your secure order for fast, tracked delivery straight to your door.

If you want to learn more about keeping your tummy happy and making sure your digestive system works perfectly, we have put together some simple guides for you. These easy-to-read articles will help you understand your body and how to feel your best:

Clinical Sources & References

To make sure all the medical information on this page is perfectly safe and correct, we verified our content against the following trusted UK health experts:

  1. NHS: Bisacodyl Health Information
  2. EMC: Dulcolax 5mg Gastro-resistant Tablets Patient Information Leaflet
  3. NHS: Laxatives Overview
  4. BNF NICE: Bisacodyl Prescribing Guidelines
  5. Patient.info: Bisacodyl to Treat Constipation

Our Commitment to Content Accuracy

UK Meds is committed to providing clear, accurate and up-to-date medical information in line with our Editorial Policy and Content Policy. All content is regularly reviewed to help you make informed decisions before purchasing your over-the-counter medication.

Medical Disclaimer: The information on this page is not a substitute for medical advice. Always read the patient information leaflet and speak to a doctor or pharmacist before beginning any treatment.

Page Last Updated: 17th April 2026

Author

Content author

Scott Weaver

Medical Content Writer • Bachelor of Arts Degree

Scott is an experienced, skilled medical content writer dedicated to creating helpful and accessible health and wellbeing content for UK Meds.

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