Bisacodyl

What is bisacodyl?

Bisacodyl is a stimulant laxative for treating constipation. It stimulates bowel muscles to move stool through the intestines. Available as tablets and suppositories, it is sold under brands like Dulcolax. You can buy it in pharmacies as well as on prescription[1]. 

What is bisacodyl used for?

Bisacodyl is mainly used to relieve occasional constipation. In other cases, it can also be used for emptying the bowels before medical procedures such as surgery or a colonoscopy[1]. 

Before using bisacodyl, try introducing more fibre into your diet, drinking more water, and exercising to help constipation symptoms. It should only be used if you have already tried other types of laxatives like fybogel (ispaghula husk), lactulose, and macrogol[1]. 

How does bisacodyl work?

Bisacodyl acts by stimulating the nerve endings in the colon walls, resulting in increased frequency and intensity of bowel muscle contractions. This facilitates the movement of stool through the bowel and promotes a bowel movement[1].  

Who can take bisacodyl?

Bisacodyl is suitable for most adults. Children aged 12 years and over (both tablets and suppositories) can take it if recommended by a doctor or pharmacist. Children aged 11 years and under may be able to be treated with suppositories and tablets, but only if prescribed by a doctor[1].  

Bisacodyl is typically not suitable for people who have[1]: 

• An intestinal blockage 

• Signs of dehydration 

• Severe stomach pain with sickness or nausea 

• Ulcerative colitis or Chron’s disease 

• Problems moving food and liquid through your bowel due to muscle issues 

• Are severely dehydrated 

• Appendicitis or unexplained severe abdominal pain 

• Are allergic to bisacodyl 

For suppositories, tell your doctor or pharmacist if you’ve ever had an allergic reaction to them or have any tears or open sores (anal fissures) or cracked skin around your bottom[1]. 

Please tell your doctor or pharmacist about any conditions you may have or medication you take before you start treatment, and always follow the instructions in the Patient Information Leaflet[2].  

How do you take bisacodyl?

Bisacodyl tablets should be swallowed whole with water – do not chew or crush them. If you’re using suppositories, they should be inserted gently into the rectum, pointed end first. Don’t take bisacodyl tablets with milk or antacids, as these can dissolve the protective coating too early and affect how well they work[1].  

What is the typical dosage of bisacodyl?

A typical adult dose of bisacodyl is between 5 to 10mg. This is usually 1 or 2 tablets, taken at night for a bowel movement the next morning. If you have not taken bisacodyl before, start with one 5mg tablet. If that does not work, you can increase the dose to a maximum of two tablets (10mg) at bedtime. One suppository, usually 10mg for adults and children over 10 or 5mg for children aged 4 to 9, can be inserted into the rectum for relief within 10 to 60 minutes. It’s important to always follow the instructions on the packaging or as prescribed by your doctor or pharmacist[1]. 

Can you stop taking bisacodyl suddenly?

Yes, you can stop taking bisacodyl as needed as it is intended for short-term use only. You can stop using it once your bowel movements return to normal – using it regularly over a long period can lead to dependency or worsen constipation[1]. 

What should you do if you take too much bisacodyl?

Taking too much bisacodyl may cause symptoms such as diarrhoea, stomach cramps, or dehydration. If this happens, you should drink plenty of fluids and contact your doctor or call NHS 111 for advice[1]. 

What should you do if you forget a dose of bisacodyl?

If you miss a dose of bisacodyl, skip it and take your next dose as usual. Do not take a double dose to make up for a missed one[1]. 

What medicines should you avoid while taking bisacodyl?

You should avoid taking bisacodyl with antacids as these can impair how well they work. Likewise, you should avoid milk or dairy products within one hour of taking tablets, and diuretics or steroids, as these may increase the risk of electrolyte imbalance[1].  

Always inform your doctor or pharmacist about all medications and supplements you take before you start a new medicine, and follow the instructions in the Patient Information Leaflet[2]. 

What are the side effects of bisacodyl?

The most common side effects are usually mild, including stomach cramps, diarrhoea, and nausea. In rare cases, serious side effects may include severe dehydration and electrolyte imbalance[1].  

You should contact your GP if you experience any of these symptoms. In rare cases, the medicine may cause a serious allergic reaction (anaphylaxis). You should call 999 or visit A&E immediately if you believe this is happening[1]. 

Symptoms of anaphylaxis include: 

• Difficulty breathing 

• Tightness in throat and chest 

• Swelling of the tongue or throat 

• Feeling faint or dizzy 

• Blue/grey skin or lips 

• Loss of consciousness 

If you experience any side effects, including those not listed, you are encouraged to report them via the Yellow Card Scheme or contact your doctor, pharmacist, or nurse. This information is intended as a summary for general awareness and does not replace professional medical advice. 

The information provided in the side effects section is not a comprehensive list of all possible side effects associated with this medication. For a complete list of side effects, please refer to the Patient Information Leaflet (PIL) provided with your medication or consult your healthcare professional[2]. 

Frequently asked questions about bisacodyl

How long does bisacodyl take to work? 

Bisacodyl works fairly quickly – tablets usually take 6 to 12 hours, while suppositories work faster, typically within 10 to 60 minutes[1]. 

Can I take bisacodyl every day? 

No, bisacodyl should only be used for short-term relief. Regular use is not recommended unless prescribed as it can lead to unwanted side effects[1]. 

Is bisacodyl safe during pregnancy? 

It is generally considered safe to take bisacodyl while pregnant, but you should speak to your doctor or pharmacist to make sure[1]. 

Can I take bisacodyl with food? 

Yes, you can take bisacodyl with most food. However, you should avoid milk or antacids around the time you take it as they may interfere with the tablet’s coating[1]. 

Can children take bisacodyl? 

Children aged 10 and over can take bisacodyl, while younger children should only be given it under medical supervision[1]. 

What if bisacodyl does not work? 

If bisacodyl isn’t working for you, you can try increasing your fluid and fibre intake. If you still do not get relief, consult your doctor or pharmacist for further guidance[1]. 

Can I drink alcohol with bisacodyl? 

Yes, alcohol is safe to have in moderation with bisacodyl. It can, though, worsen dehydration, so drink plenty of water[1]. 

Is bisacodyl habit-forming? 

Bisacodyl carries the risk of being habit-forming if you use it long-term. That’s why it’s important only to use it as directed for occasional relief when you need it most[1]. 

Can I use bisacodyl for weight loss? 

No, bisacodyl is not safe or effective for weight loss and should not be used for this purpose in any circumstances[1]. 

What is the difference between bisacodyl and other laxatives? 

Bisacodyl is a stimulant laxative. Others may work differently, such as bulking the stool or drawing water into the bowel, while having similar results[1]. 

For the official NHS guide to bisacodyl, visit their website.