Dulcolax 5mg Tablets is the original branded bisacodyl tablet that is used as a stimulant laxative for short-term relief of constipation in adults and children from age 10.
Each enteric-coated tablet contains 5mg of bisacodyl, which acts directly on the wall of the large bowel to stimulate muscle contractions and produce a bowel movement typically 6 to 12 hours after dosing.
Available from Courier Pharmacy in a 100-tablet pack under pharmacist supervision.
Dulcolax 5mg Tablets are the original branded bisacodyl tablets. People have used bisacodyl as a stimulant laxative for decades. Boehringer Ingelheim developed it in the 1950s, and Sanofi now makes Dulcolax. Many patients still choose the brand because it feels familiar and reliable.
What Dulcolax 5mg Tablets are
Each tablet contains 5mg bisacodyl. Bisacodyl is a stimulant laxative, which means it helps the bowel move. Dulcolax suits short-term constipation relief in adults and children aged 10+.
How Dulcolax works
Dulcolax tablets have an enteric (gastro-resistant) coating. This coating protects the medicine from stomach acid. It also helps the tablet release bisacodyl in the large bowel, where it needs to work.
Once released, bisacodyl stimulates the bowel wall. As a result, it helps trigger bowel contractions and supports a bowel movement.
How long it takes to work
Most people take Dulcolax at bedtime. It usually works within 6 to 12 hours, so you often feel the effect the next morning.
In comparison, osmotic laxatives can take 1 to 3 days to work fully. Rectal products can work faster, but they are not for everyone.
How to take Dulcolax tablets
Swallow the tablets whole with water. Do not crush or chew them. Also avoid taking Dulcolax at the same time as:
antacids
milk
other products that reduce stomach acid
These can damage the coating and make the tablet work too early.
Where Dulcolax fits in constipation care (UK approach)
Constipation care often works best as a step-by-step plan:
Start with lifestyle changes (fibre, fluids, movement, toilet routine)
Then try bulk-forming laxatives
Next, consider osmotic laxatives
After that, use stimulant laxatives like bisacodyl for short-term relief
In specific cases, use rectal treatments when you need fast, local action
So, Dulcolax often works well as a short-term option. It is not usually the first choice for long-term constipation.
When Dulcolax may be useful
Dulcolax can help in several situations, including:
short-term constipation that has not improved with lifestyle changes
constipation linked to opioid medicines (often as part of a wider plan)
constipation after surgery or anaesthetic
travel-related constipation
constipation linked to reduced movement
Long-term use: when to get advice
Dulcolax is not a good fit for daily use over months without review. If you need it often, speak to a pharmacist or GP. That way, you can check for causes and choose a safer long-term plan.
The Dulcolax product range (quick guide)
“Dulcolax” can mean different products. For example:
Dulcolax Suppositories: bisacodyl suppositories for faster action
Dulcolax Pico / Liquid: sodium picosulfate (a different laxative)
Dulcolax Soft Chews: a chewable product with different ingredients
Because of this, always check the label and leaflet for the exact product you have.
Dulcolax vs generic bisacodyl
Generic bisacodyl 5mg tablets contain the same active ingredient at the same strength. They also meet UK standards for quality and bioequivalence. The effect is usually the same.
However, some people prefer Dulcolax because:
they recognise the brand
they like the packaging or tablet style
they feel confident using what they know
Others prefer generic bisacodyl because it often costs less.
Key features and specifications
Active ingredient: bisacodyl 5mg per tablet
Form: enteric-coated (gastro-resistant) tablet
Pack size: 100 tablets
Indication: short-term constipation relief (adults and children aged 10+)
Typical adult dose: 1–2 tablets at night (5–10mg)
Onset: usually 6–12 hours
How long to use: generally up to 1 week without clinical review
Legal category: smaller packs may be GSL; larger packs are usually supplied as Pharmacy (P) with pharmacist support
Supplied by: Courier Pharmacy (UK GPhC-registered) with pharmacist support
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When constipation hasn’t responded to dietary fibre and bulk-forming laxatives, or when a faster, more reliable bowel movement is needed for occasional use, Dulcolax is the original branded bisacodyl tablet that has been a familiar name in UK households for over 70 years. Manufactured by Sanofi, Dulcolax delivers bisacodyl in enteric-coated tablets designed for overnight use and morning effect.
At Courier Pharmacy, we believe healthcare should suit the person, not the marketing budget. For patients who prefer the branded original, who have found Dulcolax works reliably for them, or who are buying for occasional use across the year, the 100-tablet pack provides a sensible larger pack size that lasts. This page covers where Dulcolax fits in modern constipation care, how to use it well, and when other approaches might suit you better.
Five key takeaways
Dulcolax 5mg Tablets is a UK General Sales List (GSL) and Pharmacy (P) medicine (depending on pack size) used as a stimulant laxative for short-term relief of constipation in adults and children from age 10
Dulcolax is the original branded bisacodyl tablet (Sanofi); generic bisacodyl 5mg tablets are bioequivalent at lower cost and many patients prefer them, but the brand has decades of patient familiarity and reliable quality control behind it
Taken at night, Dulcolax typically produces a bowel movement 6 to 12 hours later, making it useful when you want overnight action for morning effect
Standard adult dose is 5mg to 10mg (one or two tablets) at night. The 100 pack provides a substantial supply for intermittent use across the year rather than continuous daily use
The tablets are enteric-coated and must be swallowed whole, not crushed, chewed, or taken alongside antacids or milk, because the coating is designed to release the active ingredient in the large bowel rather than the stomach
Product description: Dulcolax 5mg Tablets
Dulcolax 5mg Tablets is the original branded version of bisacodyl, one of the most established stimulant laxatives in UK and global practice for over 70 years.
The tablets are small, round, and enteric-coated. The enteric coating is clinically important: it protects the active ingredient from acid breakdown in the stomach and small intestine, releasing it in the large bowel where it acts on the colonic mucosa and smooth muscle to stimulate peristalsis. Because of the coating, the tablets must be swallowed whole, not crushed or chewed, and should not be taken alongside antacids, milk, or other substances that raise gastric pH and could compromise the coating before the tablet reaches the large bowel.
The clinical use pattern is straightforward. A single dose of one or two tablets (5 to 10mg) taken at bedtime produces a bowel movement typically 6 to 12 hours later, which is the next morning for most patients. This overnight-to-morning timing is one of the practical strengths of Dulcolax: you take it at night, sleep through the slow onset, and wake to an effective bowel movement. By contrast, oral osmotic laxatives can take 1 to 3 days for full effect, and rectal preparations work within minutes but require rectal administration.
The clinical position of Dulcolax (and bisacodyl generically) in modern UK constipation care follows the stepped approach recommended by NICE Clinical Knowledge Summaries and the British National Formulary:
First-line: lifestyle measures (gradual increase in dietary fibre to around 30g daily, hydration of 1.5 to 2 litres of fluid daily, regular exercise, not delaying the urge to defecate, sensible toilet posture)
Second-line: bulk-forming laxatives (ispaghula husk / Fybogel, methylcellulose) to add stool bulk and water content
Third-line: osmotic laxatives (macrogol / Movicol or Laxido, lactulose) to draw water into the bowel
Fourth-line: stimulant laxatives including bisacodyl (Dulcolax), senna (Senokot), and sodium picosulfate (Dulcolax Pico) to stimulate bowel motility
Specific situations: rectal preparations (glycerol or bisacodyl suppositories, Micralax Micro-enema, phosphate enemas) for faecal loading in the rectum or when oral medicines are unsuitable
For refractory constipation: specialist review for newer agents (prucalopride, linaclotide, lubiprostone) and assessment for underlying causes
Dulcolax sits in the fourth-line position for chronic constipation, after fibre, bulk-forming, and osmotic laxatives have been tried. It is also used in several specific situations:
Acute constipation episodes in patients who have not responded to immediate lifestyle and bulk-forming measures
Constipation associated with opioid use (opioid-induced constipation), often alongside other agents
Post-operative constipation after general anaesthesia or abdominal surgery where bowel motility is temporarily reduced
Pre-procedure bowel preparation for some colonoscopy regimens (alongside other agents)
Travel-related constipation for occasional short-term use
Constipation in immobile patients where reduced movement is contributing to slow bowel transit
Dulcolax is not the right answer for ongoing daily use over months or years in most patients. The reasons are partly historical concerns about laxative “dependence” (which is more nuanced than the historical view suggested) and partly that the underlying constipation pattern usually needs different management for sustainable improvement. Short-term use, intermittent use, and use during specific episodes are all reasonable; daily use over extended periods warrants review.
The Dulcolax brand and product family
The Dulcolax brand from Sanofi covers several different products that are all distinct from each other despite sharing the brand name:
Dulcolax 5mg Tablets (this product): enteric-coated bisacodyl tablets for overnight oral use
Dulcolax Suppositories: bisacodyl rectal suppositories for faster action (15 to 60 minutes), useful when oral administration is unsuitable
Dulcolax Pico: sodium picosulfate (a different active ingredient), available as liquid or tablets, similar overnight timing
Dulcolax Liquid: sodium picosulfate liquid form
Dulcolax Soft Chews: a chewable formulation containing magnesium hydroxide and sodium picosulfate
When patients refer to “Dulcolax” they usually mean the original tablets (this product), but the brand family is broader than just the one preparation. The patient information leaflet for each specific product should be checked because the dosing and considerations differ.
Brand versus generic
Dulcolax is the originator branded product. Generic bisacodyl 5mg tablets from various UK-licensed manufacturers contain the same active ingredient at the same strength, meet the same regulatory standards for bioequivalence, and are typically available at lower cost. The clinical effect is essentially identical between brand and generic.
Patients sometimes prefer the brand for reasons of:
Familiarity from years of reliable use
Confidence in a recognised name when reaching for a medicine
The specific tablet appearance, packaging, or patient information leaflet they are used to
Patients sometimes prefer the generic for reasons of:
Lower cost, particularly for larger pack sizes
No clinical difference in expected effect
Pragmatic choice when the medicine is essentially a commodity at the active ingredient level
Both choices are reasonable. We supply Dulcolax for patients who prefer the brand, and generic bisacodyl 5mg for patients happy with the unbranded version. Discuss with our pharmacist if you would like advice on the choice.
Indication: short-term relief of constipation in adults and children from age 10
Standard adult dose: 5 to 10mg (1 to 2 tablets) at night
Onset of action: typically 6 to 12 hours after dosing (overnight to morning effect)
Maximum duration of continuous use: generally up to 1 week without prescriber review; longer use warrants discussion
Legal category: General Sales List (smaller packs) or Pharmacy (P) (larger packs); the 100-pack is typically supplied under pharmacist supervision
Supplied by: Courier Pharmacy, UK GPhC-registered, with pharmacist support
Why choose Courier Pharmacy for Dulcolax 5mg Tablets
At Courier Pharmacy, our whole approach is built around the idea that healthcare should fit the person, not the marketing budget. For Dulcolax, that means honest framing of where it fits, how to use it well, and when to step back to consider the wider picture. Our service is shaped by the philosophy of Dr Ada Jex-Cori, our brand pharmacist, who has built her practice around accessible, honest, personalised care. Her view is straightforward: you are not broken. The system is the problem. We are here to change that.
Brand or generic? Your choice, our honest advice
We supply both the original branded Dulcolax (this product, from Sanofi) and generic bisacodyl 5mg tablets. The clinical effect is essentially identical at the active ingredient level, but patients have their own reasons for preferring one or the other. Some want the brand they have trusted for years; some prefer the generic at lower cost. Both are reasonable, and we won’t push one over the other. If you would like our pharmacist’s view on the choice for your situation, just ask.
Honest framing of where Dulcolax fits
For occasional constipation episodes, post-operative constipation, travel-related constipation, opioid-induced constipation, and specific situations where a faster overnight effect is needed, Dulcolax is a genuinely useful option. We supply the 100 pack for patients managing ongoing intermittent need across the year rather than expecting daily use.
For chronic constipation requiring daily laxative support, the conversation needs to be different. The starting point should usually be lifestyle measures and bulk-forming or osmotic laxatives, with Dulcolax reserved for episodes rather than daily use. We are happy to work through the wider picture with you.
Pharmacist support before and after purchase
Our pharmacist is available for advice on:
Whether Dulcolax is the right option for your situation, or whether another approach would suit you better
The correct use of the enteric-coated tablets and the timing for morning effect
Managing side effects or unexpected responses
The wider stepped approach to constipation if you’re dealing with an ongoing pattern
Whether your symptoms warrant GP review
This is free and available before and after purchase. Get in touch if you have any questions.
Care for specific patient groups
We are happy to provide tailored support for:
Patients on opioid pain relief where constipation is a recurrent challenge, where we can discuss the wider opioid-induced constipation approach including newer options like naloxegol
Older patients where the gentler approaches may be safer first-line
Patients preparing for surgery or colonoscopy where Dulcolax has a specific bowel preparation role
Patients with travel-related or short-term constipation where intermittent use is appropriate
Patients with IBS-C (constipation-predominant IBS) where the wider IBS picture needs consideration rather than just laxative supply
Coordination with your GP and other care
If you have a GP, district nurse, or other healthcare professional involved in your care, we are happy to coordinate. For patients with chronic constipation, joined-up care across primary care, pharmacy, and (when needed) gastroenterology produces better outcomes than fragmented care.
Trust earned, not claimed
We are GPhC-regulated, we ground our content in NHS, NICE, BNF, and EMC guidance, and we will tell you honestly if Dulcolax isn’t the right answer for your situation. We’d rather give you the right advice than a quick sale.
How to buy Dulcolax 5mg Tablets (100 pack) from Courier Pharmacy
Dulcolax 5mg Tablets in the 100-pack size is supplied through Courier Pharmacy under pharmacist supervision. The supply does not require a prescription, but the pharmacist will check that the use is appropriate for your situation.
Here is how our service works:
Add Dulcolax 5mg Tablets to your basket and complete a quick questionnaire about your symptoms, what you’ve already tried, any current medicines, and any relevant medical conditions
Our pharmacist reviews your answers to confirm Dulcolax is suitable for you. Where the pharmacist needs to ask additional questions or recommend alternatives, we will do so before completing the supply
Once approved, your order is prepared and dispatched discreetly to your door
Free pharmacist support is available before and after your purchase for any questions
If Dulcolax isn’t the right product for your situation, we will explain why and suggest alternatives. That might be:
Lifestyle and oral measures if you’ve not yet had a fair trial of these
Bulk-forming laxatives (ispaghula husk / Fybogel) if regular fibre supplementation hasn’t been tried
Osmotic laxatives (macrogol / Movicol, lactulose) for the foundation of chronic constipation management
Generic bisacodyl 5mg tablets if you would prefer the unbranded equivalent at lower cost
Senna or sodium picosulfate (Dulcolax Pico) if you’ve not responded well to bisacodyl previously and want a different stimulant laxative
Dulcolax Suppositories if you need a faster-acting rectal alternative
Rectal preparations (glycerol suppositories, Micralax Micro-enema) if rectal loading is the dominant issue
A GP appointment if your constipation has red flags or doesn’t fit the typical picture
A different approach entirely if your symptoms suggest IBS, inflammatory bowel disease, or other underlying conditions needing assessment
Our free fortnightly drop-in clinics at Insomnia, Derby run every other week from 10am to 12pm. Bowel health, constipation, IBS, IBD, haemorrhoids, anal fissures, MCAS, hair loss, men’s health, weight management, and the broader conversations about wellbeing are all topics we cover regularly at these sessions. No appointment needed, no charge, no pressure.
Active ingredients
Each enteric-coated tablet contains:
Bisacodyl 5mg (active ingredient): a stimulant laxative of the diphenylmethane class, acting directly on the wall of the large bowel to stimulate peristalsis and produce a bowel movement
Patients with lactose intolerance, sucrose intolerance, or hereditary fructose intolerance should check the patient information leaflet of the specific pack supplied. Modern Dulcolax tablets are generally considered suitable for diabetic patients, though the sucrose content means that very large or frequent doses warrant consideration. Patients with concerns about specific excipients should contact our pharmacist before purchase.
Dulcolax 5mg Tablets is the originator brand (Sanofi). Generic bisacodyl 5mg tablets from various UK-licensed manufacturers are bioequivalent and meet the same regulatory standards at typically lower cost.
What are Dulcolax 5mg tablets used for?
Constipation affects 10 to 20% of UK adults at any given time, with higher prevalence in women, older adults, and people with certain conditions or on certain medicines. Most cases respond to first-line measures, but a meaningful minority need additional treatment, and a smaller minority have refractory constipation that warrants specialist input.
The treatment of constipation in modern UK practice follows a stepped approach. The honest position of Dulcolax (bisacodyl) in this approach is the fourth-line option for most patients, although there are specific situations where it has a primary role.
First-line: lifestyle measures
The foundation of constipation treatment, and prevention of recurrence, is lifestyle. The components that matter most are:
Fibre intake: around 30g daily from food sources where possible. Wholegrains, beans and lentils, fruit, vegetables, nuts, and seeds are all good sources. Increase gradually to avoid bloating and wind.
Hydration: 1.5 to 2 litres of fluid daily, mostly water or other non-strongly-caffeinated, non-alcoholic fluids
Physical activity: regular movement supports bowel motility. A 20 to 30 minute walk most days makes a measurable difference
Toilet habits: respond to the urge promptly, use a slightly squatting position (footstool helps), keep toilet time short and focused
Address contributing medicines: opioids, iron, calcium channel blockers, some antidepressants, anticholinergics, some chemotherapy agents all cause or worsen constipation. Where alternatives exist, discuss with the prescriber
Around half of patients with mild to moderate chronic constipation respond well to lifestyle alone.
Second-line: bulk-forming laxatives
If lifestyle measures aren't enough, the first medicine option is usually a bulk-forming laxative. These mimic the effect of dietary fibre by absorbing water and adding bulk to the stool.
Ispaghula husk (Fybogel, Ispagel)
Methylcellulose (Celevac)
Bulk-forming laxatives work over days rather than hours. They need to be taken with plenty of water and are not suitable for patients with significant dehydration, bowel obstruction, or who can't drink adequate fluids.
Third-line: osmotic laxatives
If bulk-forming laxatives aren't enough or aren't tolerated, osmotic laxatives are the next step.
Macrogol (Movicol, Laxido, CosmoCol): polyethylene glycol with electrolytes. Generally well-tolerated and effective
Lactulose (Duphalac, Laevolac): a synthetic sugar drawing water into the bowel. Can cause bloating and wind
Magnesium hydroxide (Milk of Magnesia): older but still useful in selected patients
Osmotic laxatives typically work over 1 to 3 days. They are generally the medicine class of choice for chronic constipation management when lifestyle and bulk-forming options aren't sufficient.
Fourth-line: stimulant laxatives
If osmotic laxatives are insufficient, stimulant laxatives can be added or substituted. They produce a faster effect (typically 6 to 12 hours) and work through direct stimulation of bowel muscle contractions.
The main stimulant laxatives in UK practice:
Bisacodyl (Dulcolax tablets, generic bisacodyl): enteric-coated tablets typically taken at night for morning effect; also available as suppositories for faster action
Senna (Senokot, generic senna): plant-derived stimulant laxative, similar overnight-to-morning timing
Sodium picosulfate (Dulcolax Pico, Laxoberal): liquid or tablet form, similar timing, often used overnight
The choice between these is partly clinical (slight differences in side effect profile and onset) and partly patient preference (tablet versus liquid form, brand familiarity). Bisacodyl and senna are the most commonly used; sodium picosulfate has a slight edge for some patients because of its different chemistry and faster onset in some cases.
Stimulant laxatives are generally for short-term use rather than continuous daily use over months or years. The reasons:
The underlying constipation pattern usually needs different management for sustainable improvement
Long-term daily use can sometimes lead to reduced effect at the same dose (tolerance), although this is less common and less significant than the historical view suggested
Repeated daily strong bowel stimulation isn't ideal physiology over years
Patients on long-term daily stimulant laxatives often need review to consider alternatives or address underlying contributors
That said, there are clinical situations where ongoing stimulant laxative use is appropriate under prescriber supervision: opioid-induced constipation (where the underlying medicine cause persists), longstanding refractory constipation under specialist care, palliative care, and some patients with significant comorbidities affecting bowel motility.
When specialist input is appropriate
A small proportion of patients have constipation that doesn't respond to standard stepped treatment. Refractory constipation may warrant assessment for:
Underlying causes such as hypothyroidism, hypercalcaemia, diabetes, neurological conditions, or pelvic floor dysfunction
Slow-transit constipation, where colonic motility is the dominant problem
Outlet dysfunction (functional defaecation disorders), where the problem is at the pelvic floor and anorectal coordination
Newer prescription agents like prucalopride (5-HT4 receptor agonist), linaclotide (guanylate cyclase-C agonist), or lubiprostone (chloride channel activator), used under specialist guidance
Bowel cancer or other structural pathology, particularly if constipation is new, associated with weight loss, bleeding, or significant change in bowel habit, or in patients over 50
If your constipation pattern doesn't fit, or if it's not responding to sensible stepped treatment, ask for a review rather than continuing to escalate stimulant laxatives.
How Dulcolax works
Dulcolax contains bisacodyl, a stimulant laxative of the diphenylmethane class. Its mechanism of action involves direct effects on the wall of the large bowel.
After you swallow a Dulcolax tablet, the enteric coating protects the active ingredient from breakdown by stomach acid. The coating begins to dissolve in the more alkaline environment of the small intestine, but the bulk of the bisacodyl reaches the large bowel intact. Once in the large bowel, bacterial enzymes and intestinal hydrolysis convert bisacodyl into its active metabolite, BHPM (bis-(p-hydroxyphenyl)-pyridyl-2-methane), which is the molecule that produces the laxative effect.
BHPM acts on the colonic mucosa and the smooth muscle of the colonic wall through several complementary mechanisms:
Direct stimulation of colonic smooth muscle: increases propulsive peristaltic contractions that move the stool toward the rectum
Effects on intestinal secretion: increases the secretion of water and electrolytes into the bowel lumen, softening the stool and increasing its volume
Effects on enteric neurons: modulates the local neural circuits in the gut wall that coordinate peristalsis
Possible effects on prostaglandin production: contributing to the secretory and motility effects
The net effect is increased colonic motility, softer stool with greater water content, and a coordinated bowel movement that typically occurs 6 to 12 hours after the oral dose.
The pharmacokinetic profile explains the overnight-to-morning timing. After oral dosing, the tablet must pass through the stomach (around 1 to 4 hours depending on gastric emptying), the small intestine (several hours of transit), and reach the large bowel. Once there, hydrolysis to the active metabolite and the subsequent motility and secretory effects take additional time. The total transit from oral dose to bowel movement averages 6 to 12 hours, with variability between patients.
Bisacodyl is poorly absorbed into systemic circulation when taken orally as enteric-coated tablets. The small amount that is absorbed is metabolised in the liver and excreted in bile and urine. The minimal systemic exposure means Dulcolax has few significant systemic drug interactions and few systemic side effects, with most adverse effects confined to the gastrointestinal system.
How to take Dulcolax 5mg Tablets
The information below is a summary for reference. The definitive guide is the patient information leaflet supplied with the product. If you are unsure about any aspect of dosing or timing, contact our pharmacist for support.
Dosing
Adults and children over 18: 5mg to 10mg (one or two tablets) taken once daily, typically at night before bed for morning effect. Start with 5mg (one tablet) and increase to 10mg (two tablets) if the lower dose is insufficient.
Children aged 10 to 17 years: 5mg (one tablet) once daily, taken at night. Higher doses or use in younger children should only be under prescriber or GP advice. Our online supply through Courier Pharmacy is for adults only; paediatric supply should be coordinated through the child's GP.
Older patients: standard adult dose, although it may be reasonable to start with 5mg and assess response before increasing. Older patients can be more sensitive to laxative effects.
When to take
Dulcolax is typically taken at night before bed. The 6 to 12 hour onset means an evening dose produces a bowel movement the following morning, which is the practical and dignified timing most people prefer.
Some patients find that the optimal time for them is mid-evening (around 7 to 9pm) for a morning effect, while others prefer just before bed (10 to 11pm). Adjusting the timing by a couple of hours allows you to fine-tune when the morning bowel movement happens.
If the morning effect is not strong enough, an additional dose later the same day is not appropriate; the right adjustment is usually to increase from 5mg to 10mg the following night, or to address other factors (fluid intake, fibre intake) alongside.
How to take
Swallow the tablet whole with a glass of water
Do not crush, chew, or break the tablet, because this damages the enteric coating that protects the active ingredient from stomach acid
Do not take with milk or large quantities of dairy products, because milk raises gastric pH and can compromise the enteric coating before the tablet reaches the large bowel
Do not take within 1 hour of antacids or other acid-suppressing medicines for the same reason. If you take a PPI (omeprazole, lansoprazole, pantoprazole, esomeprazole) or H2 antagonist (famotidine), the ongoing acid suppression may slightly reduce the effectiveness of the enteric coating, although this is usually not a major clinical concern
Take with water, ideally a full glass
How long can you take Dulcolax?
For acute constipation episodes: short courses of 3 to 7 days are typical. Continue until the constipation is settled and bowel function has returned to normal, then stop and address the underlying factors with lifestyle and other measures.
For ongoing constipation requiring stimulant laxative support: discuss with our pharmacist or your GP about the wider plan. Daily continuous use over weeks to months without prescriber input is not recommended; longer-term use under prescriber guidance is appropriate in specific clinical situations.
If you find yourself needing Dulcolax every day for ongoing constipation, this is usually a signal that the underlying pattern needs different management rather than continued daily stimulant laxative use.
Missing a dose
If you miss a dose, simply take the next dose at the usual time the following day. Do not double-dose to catch up.
Storage
Store at room temperature, below 25°C, in the original packaging to protect from moisture. Keep out of sight and reach of children. Do not use after the expiry date printed on the pack.
Warnings and precautions
When not to use Dulcolax
Dulcolax should not be used in:
Patients with known hypersensitivity to bisacodyl or any tablet excipient
Patients with intestinal obstruction or suspected obstruction
Patients with acute inflammatory bowel disease (severe flares of Crohn's disease or ulcerative colitis)
Patients with severe dehydration
Patients with acute abdominal conditions including appendicitis or undiagnosed severe abdominal pain
Patients with severe nausea or vomiting where a stimulant laxative could worsen the situation
Children under 10 without prescriber guidance
When to seek assessment rather than self-treat
The use of Dulcolax assumes the constipation is straightforward and the cause is understood. Several patterns warrant medical assessment instead of (or before) over-the-counter laxative use:
Constipation that is new and persistent in a patient over 50, particularly with weight loss, blood in stool, or significant change in bowel habit (red flags for possible bowel cancer)
Constipation associated with significant abdominal pain, vomiting, or abdominal distension (possible obstruction)
Constipation in patients with significant comorbidities including heart failure, kidney disease, liver disease, or active inflammatory bowel disease
Chronic constipation requiring daily laxative use for more than a week or two without resolution
Constipation alternating with diarrhoea (suggestive of IBS or other conditions warranting assessment)
Constipation in young children with associated soiling, behavioural symptoms, or distress
Constipation with significant rectal bleeding, anal pain, or signs of fissure or haemorrhoids needing assessment
If any of these apply, contact your GP or our pharmacist rather than continuing self-treatment.
Pregnancy and breastfeeding
Dulcolax can be used in pregnancy when needed, but bulk-forming laxatives (ispaghula husk) and osmotic laxatives (lactulose, macrogol) are generally preferred as first-line because of their gentler mechanism. Stimulant laxatives like bisacodyl are second-choice options if first-line measures aren't sufficient. The systemic absorption is minimal and the medicine has been used in pregnancy for decades without evidence of significant harm, but the gentler options are still preferred where possible.
In breastfeeding, bisacodyl is generally considered safe because of the minimal systemic absorption and lack of significant transfer to breast milk. Discuss with the prescriber or our pharmacist if needed.
Older patients
Older patients can be more sensitive to laxative effects and more vulnerable to dehydration from significant bowel actions. Start with the lower 5mg dose and ensure adequate hydration. Long-term daily use in older patients warrants review more readily than in younger adults.
Patients with kidney or liver problems
Generally no dose adjustment is needed because systemic absorption is minimal. Patients with significant comorbidities should discuss with their prescriber for the wider picture.
Diabetic patients
Modern Dulcolax tablets are generally considered suitable for diabetic patients, but the sucrose content in the coating means very large or very frequent doses warrant consideration. Check the patient information leaflet of the specific pack supplied if this is relevant.
Long-term use considerations
Daily continuous use of Dulcolax over months or years is not recommended without prescriber supervision. Concerns include:
The underlying constipation pattern usually needs different management for sustainable improvement
Possible reduction in effect at the same dose with very prolonged use (tolerance), although this is less common and less clinically significant than the historical view suggested
Possible disruption to electrolyte balance with very heavy or very prolonged use, particularly potassium depletion
Mask of underlying conditions that may be contributing
For chronic constipation, the better approach is usually a combination of lifestyle measures, bulk-forming laxative, osmotic laxative as a stable foundation, and stimulant laxative like Dulcolax reserved for episodes rather than daily use.
Side effects of Dulcolax 5mg Tablets
Dulcolax is generally well-tolerated. Most side effects are mild and gastrointestinal in nature, reflecting the local action in the bowel.
Common side effects (affecting up to 1 in 10 patients)
Abdominal cramping or discomfort, often associated with the stimulated bowel movement
Diarrhoea, particularly if the dose is too high or if used alongside other laxatives
Abdominal pain
Nausea
Sensation of urgency before the bowel movement
Less common side effects
Vomiting
Headache
Dizziness
Loose stools persisting after the bowel movement
Mild electrolyte disturbance with heavy or prolonged use (potassium depletion is the main concern)
Rectal discomfort if used in combination with rectal preparations
Rare but more significant side effects
Significant electrolyte disturbance (hypokalaemia, dehydration) with very heavy or prolonged use
Allergic reactions including rash, itching, swelling
Severe abdominal pain (rare; would warrant review for obstruction or other underlying issue)
Syncope or significant hypotension after the bowel movement (rare; reported in some older patients with significant cardiovascular comorbidities)
Stop and seek advice if
You develop severe abdominal pain that does not settle with the bowel movement
You develop signs of significant dehydration (severe thirst, dry mouth, reduced urine output, dizziness)
You develop rectal bleeding beyond minor amounts on the paper
You develop signs of allergic reaction (rash, swelling, breathing difficulty)
The expected bowel movement does not happen and you develop signs of obstruction (severe pain, vomiting, abdominal distension)
You find yourself using Dulcolax daily without resolution of the underlying problem
"Tolerance" and long-term use
The historical concern about laxative dependence and "lazy bowel" from long-term stimulant laxative use has been moderated by more recent evidence. Modern understanding is that long-term stimulant laxative use is less harmful than was once thought, and is appropriate in specific clinical situations (opioid-induced constipation, palliative care, refractory constipation under specialist care).
That said, the underlying constipation pattern in most patients warrants different management for sustainable improvement, and most patients on long-term daily Dulcolax benefit from a review of the wider plan rather than continuing the same pattern indefinitely.
Yellow Card reporting
Suspected adverse drug reactions can be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. Reporting helps build the safety picture for everyone.
Drug interactions with Dulcolax 5mg Tablets
Dulcolax has a low overall drug interaction profile because systemic absorption is minimal. The interactions to consider are mostly about the enteric coating and the combined effects of laxatives.
Significant interactions
Antacids and acid-suppressing medicines (PPIs like omeprazole, lansoprazole, pantoprazole, esomeprazole; H2 antagonists like famotidine; antacid tablets and liquids like Gaviscon, Rennies): can raise gastric pH and potentially compromise the enteric coating before the tablet reaches the large bowel. Don't take Dulcolax within 1 hour before or after antacids. For patients on chronic PPI therapy, the effect is usually not clinically significant in practice
Milk and dairy products: don't take Dulcolax with milk or large quantities of dairy because of the gastric pH effect on the enteric coating
Diuretics (furosemide, bendroflumethiazide): combined use can increase the risk of hypokalaemia and dehydration, particularly with prolonged stimulant laxative use. Monitor electrolytes if both are used long-term
Cardiac glycosides (digoxin): hypokalaemia from prolonged laxative use can increase the risk of digoxin toxicity. Monitor potassium levels
Corticosteroids (prednisolone, dexamethasone, hydrocortisone): combined use can increase the risk of hypokalaemia
Other laxatives: combining multiple laxatives without prescriber guidance can produce excessive effect, electrolyte disturbance, and diarrhoea
Less significant interactions
Most blood pressure medicines, statins, antidepressants, hormonal contraceptives: no significant interaction
PDE5 inhibitors, antihistamines, paracetamol, ibuprofen: no significant interaction
Most antibiotics: no significant interaction, although prolonged broad-spectrum antibiotics can alter bowel flora and theoretically affect the conversion of bisacodyl to its active metabolite
For patients on any of the significant-interaction medicines above, our pharmacist will check the picture during your consultation.
Frequently asked questions about Dulcolax 5mg Tablets
How quickly does Dulcolax work?
Dulcolax tablets typically produce a bowel movement 6 to 12 hours after dosing, which is why an evening dose produces a morning effect. Dulcolax Suppositories work faster (15 to 60 minutes), but those are a different product.
When should I take Dulcolax?
For most patients, at night before bed. The overnight-to-morning timing means you sleep through the slow onset and wake to an effective bowel movement. If you want the bowel movement at a specific time, adjust the dose timing by a couple of hours to fit your schedule.
Is Dulcolax the same as generic bisacodyl?
Yes at the active ingredient level. Dulcolax is the branded version manufactured by Sanofi; generic bisacodyl 5mg tablets contain the same active ingredient at the same strength and meet the same bioequivalence standards. The clinical effect is essentially identical. The choice between brand and generic is usually about preference and cost rather than clinical difference.
Can I take Dulcolax with food?
Yes, food does not significantly affect Dulcolax. The main considerations are about milk and dairy (which can affect the enteric coating) and antacids (same reason), not about food generally.
Can I take Dulcolax every day?
For short courses of a few days during a constipation episode, yes. For ongoing daily use over weeks or months, no, unless under prescriber supervision. The 100 pack supplied here is intended for intermittent use across the year rather than continuous daily use.
What if Dulcolax doesn't work?
If the first 5mg dose doesn't produce a bowel movement, try 10mg (two tablets) the next night. If 10mg doesn't work after one or two nights, contact our pharmacist or your GP. The right step usually isn't to keep escalating the Dulcolax dose, but to consider whether the cause needs different management.
Can I take Dulcolax alongside other laxatives?
Dulcolax can be combined with bulk-forming laxatives (ispaghula husk) and osmotic laxatives (macrogol, lactulose) where appropriate. Don't combine multiple stimulant laxatives without prescriber guidance. Don't use Dulcolax on the same day as a rectal preparation (suppository or enema) without prescriber advice.
Is Dulcolax safe in pregnancy?
It can be used in pregnancy when needed, but gentler options (bulk-forming laxatives, lactulose, macrogol) are usually preferred first-line. Discuss with your prescriber or midwife.
Can children take Dulcolax?
The tablets are licensed for children from age 10 at the 5mg dose. Younger children, lower doses, or higher doses should only be on prescriber or GP advice. Our online supply through Courier Pharmacy is for adults; paediatric supply should be coordinated through the child's GP.
Will I become dependent on Dulcolax?
The historical concern about laxative dependence and "lazy bowel" from long-term stimulant laxative use has been moderated by more recent evidence. Long-term daily use is not ideal because the underlying constipation pattern usually needs different management, but the harm from long-term use is less than was historically feared. The conversation about long-term use should be with a prescriber rather than a default assumption.
Why do the tablets have a coating?
The enteric coating protects the active ingredient from breakdown by stomach acid. Bisacodyl needs to reach the large bowel intact to work properly. The coating dissolves in the more alkaline environment of the intestine, releasing the active ingredient where it acts.
Can I crush or split Dulcolax tablets?
No. Crushing, chewing, or splitting damages the enteric coating and exposes the active ingredient to stomach acid, which reduces effectiveness and increases the risk of stomach irritation. Swallow whole.
What if I have trouble swallowing tablets?
Discuss with our pharmacist. Bisacodyl is also available as Dulcolax Suppositories for patients who can't take tablets, and other laxative options (Dulcolax Pico liquid, lactulose, macrogol powders in water) are tablet-free.
Does Dulcolax interact with my heart, blood pressure, or diabetes medicines?
Generally no significant pharmacological interaction because systemic absorption is minimal. The interactions to know about are with antacids (timing), diuretics (potassium considerations with prolonged use), digoxin (potassium effect), and corticosteroids (potassium effect). For most patients, ongoing co-medication is not a concern.
Can I take Dulcolax if I have IBS?
For IBS-C (constipation-predominant IBS), Dulcolax can be used short-term for episodes. The wider IBS management plan (often lifestyle, FODMAP guidance, specific medicines like linaclotide for chronic IBS-C) is usually a better approach than relying on stimulant laxatives. Discuss with our pharmacist or your GP about the wider plan.
Can I take Dulcolax if I have inflammatory bowel disease?
Caution. Active flares of ulcerative colitis or Crohn's disease are a contraindication. In stable IBD, Dulcolax can sometimes be used for constipation but under gastroenterology guidance rather than as a default.
How should I store Dulcolax?
Store at room temperature, below 25°C, in the original packaging to protect from moisture. Keep out of sight and reach of children. Do not use after the expiry date.
How do I order Dulcolax 5mg Tablets from Courier Pharmacy?
Add the product to your basket on courierpharmacy.co.uk and complete the brief questionnaire. Our pharmacist will review your answers to confirm suitability and dispatch your order. Free pharmacist support is available before and after your order.
More than a prescription: our community
Healthcare shouldn't only happen when you're paying for it. Every fortnight we run free drop-in talks and clinics at Insomnia, Derby, from 10am to 12pm. Bring a question, bring a friend, bring a stack of bewildering letters from another clinic; we'll sit with you. We cover bowel health, constipation, IBS, haemorrhoids, anal fissures, IBD, MCAS, hair loss, men's health, weight management, and whatever else people bring through the door. No appointment. No cost. No pressure. Learn more about our community talks.
Disclaimer: This article is for information only and isn't a substitute for personal medical advice. Always speak to a qualified prescriber before starting or changing treatment.
How this content was created
Written by the Courier Pharmacy editorial team and reviewed by a GPhC-registered pharmacist. Grounded in the latest NHS, BNF, and EMC guidance, and the real questions patients bring to our drop-in clinics in Derby.
References
[1] Electronic Medicines Compendium (emc) (n.d.) [Title of SmPC as shown on page] – Summary of Product Characteristics (SmPC). Available at: https://www.medicines.org.uk/emc/product/361/smpc (Accessed: 27 May 2026).
