Digestive

Medicines for Irritable bowel syndrome (IBS)

A common long-term gut disorder causing abdominal pain and changes in bowel habit without damage to the bowel — managed with diet, lifestyle and medicines targeted at the main symptoms.

Education and reference only. This explains which medicines are used and why, in plain language — it deliberately contains no doses and is not a substitute for advice from your doctor or pharmacist. Always discuss your own treatment with a qualified clinician, and check the BNF and the product labelling for prescribing detail.

Written by Meds Global Health Clinical Team · Clinically reviewed by Dr Muhammad Suffyan, MB BS, Founder & Clinical Director · Last reviewed · How we review

Quick answer

What is Irritable bowel syndrome (IBS)?

Irritable bowel syndrome is a common condition in which the gut behaves abnormally — being more sensitive and contracting differently — without any visible damage or disease of the bowel itself. It causes abdominal pain or discomfort, often relieved by opening the bowels, along with bloating and a change in bowel habit.

  • How it is treated: Management is tailored to the main symptoms and starts with diet and lifestyle.
  • Self-care: Regular meals, good hydration, managing stress and staying active all help.
  • When to seek help: See your GP if you notice red-flag features — bleeding from the bottom, unexplained weight loss, a persistent change in bowel habit (especially over the age of 50), or symptoms that wake you at night — as these need investigation to exclude other conditions.

What it is

Irritable bowel syndrome is a common condition in which the gut behaves abnormally — being more sensitive and contracting differently — without any visible damage or disease of the bowel itself. It causes abdominal pain or discomfort, often relieved by opening the bowels, along with bloating and a change in bowel habit. People are usually grouped by their main pattern: constipation-predominant (IBS-C), diarrhoea-predominant (IBS-D) or mixed (IBS-M). Symptoms tend to come and go and are often linked to stress, diet and the interaction between the gut and the brain — the so-called gut-brain axis. IBS is diagnosed positively from the typical pattern of symptoms, but only after red-flag features have been excluded: unexplained bleeding, weight loss, anaemia, a family history of bowel or ovarian cancer, or a change in bowel habit over a certain age all prompt investigation to rule out other causes first.

How it is treated

Management is tailored to the main symptoms and starts with diet and lifestyle. Medicines are then chosen to target the dominant problem: antispasmodics for cramping and pain, laxatives for constipation-predominant IBS, and antidiarrhoeals for diarrhoea-predominant IBS. Where pain and gut sensitivity persist, a low-intensity course of a tricyclic antidepressant can be used specifically to calm the gut — here it is prescribed for its effect on gut pain, not to treat depression — with an SSRI as an alternative gut-brain option. Because stress and mood interact strongly with IBS, psychological therapies such as cognitive behavioural therapy can also help. Treatment is reviewed and adjusted, as symptoms and triggers vary over time.

For this condition, these medicines

Medicine classes used for Irritable bowel syndrome (IBS)

Each links to a full, dose-free guide — what it is, how it works, who can and cannot use it, side effects, interactions and FAQs.

Antispasmodics Gastrointestinal Ease cramping and abdominal pain by relaxing the gut muscle. Laxatives Gastrointestinal For constipation-predominant IBS; non-stimulant types are generally preferred for regular use. Antidiarrhoeals Gastrointestinal For diarrhoea-predominant IBS, to slow the gut and firm the stool. Tricyclic antidepressants Mental health Used at low intensity for persistent pain and gut sensitivity — for the gut effect, not to treat depression here. SSRIs Mental health An alternative gut-brain option where a tricyclic is unsuitable or not tolerated.

Symptom checker

Symptoms that can point to Irritable bowel syndrome (IBS)

Irritable bowel syndrome (IBS) can be one cause of these symptoms. Each guide explains the other possible causes and the red-flag warning signs that mean you should get urgent help:

Abdominal painPain anywhere between the chest and the groin — cramping, burning, gnawing or sharp — whic…DiarrhoeaPassing looser or more frequent stools than normal, usually settling within a few days.…BloatingA feeling of fullness, tightness or swelling in the tummy, often with trapped wind.…ConstipationPassing stools less often than usual, or finding them hard, dry and difficult to push out …Wind and bloating with flatulenceFrequent burping, a bloated, full tummy and passing more wind than usual, almost always fr…Swollen or bloated abdomenA tummy that feels full, tight, distended or visibly larger than usual — most often from t…Feeling full quicklyFeeling full after eating only a small amount, or losing your appetite earlier than usual …

By active ingredient

Specific medicines used for Irritable bowel syndrome (IBS)

Dose-free guides to individual active ingredients used in irritable bowel syndrome (ibs) — what each is, how it works, how to take it, and its advantages and disadvantages:

AmitriptylineAn older antidepressant that, at low intensity, is one of the most useful treatments for n…LoperamideAn over-the-counter medicine that slows the gut to control short-term diarrhoea — safe use…Hyoscine butylbromideAn antispasmodic that relaxes gut muscle to ease cramping abdominal pain, including in IBS…MebeverineAn antispasmodic that relaxes gut muscle to relieve the cramping pain and spasm of irritab…DicycloverineAn antimuscarinic antispasmodic that relaxes gut muscle to relieve cramping pain in condit…AlverineAn antispasmodic that relaxes gut muscle to ease the cramping pain, spasm and discomfort o…Peppermint oilA naturally derived antispasmodic that relaxes gut muscle to ease the cramping, bloating a…RifaximinAn antibiotic that stays mostly in the gut, used to prevent recurrence of hepatic encephal…LinaclotideA medicine used for irritable bowel syndrome with constipation, helping the bowels move an…LubiprostoneA medicine for chronic constipation and IBS with constipation that draws fluid into the bo…PlecanatideA daily tablet used for chronic constipation and constipation-type IBS in adults.…TenapanorA gut-acting medicine for irritable bowel syndrome with constipation, also used to lower p…HyoscyamineAn antimuscarinic medicine that relaxes the gut to ease cramps and can dry up secretions.…AlosetronA specialist medicine used only for severe diarrhoea-predominant IBS in women when usual t…ClidiniumAn antispasmodic, usually combined with chlordiazepoxide, used to ease gut cramping and sp…

Beyond medication

Lifestyle and self-care

Regular meals, good hydration, managing stress and staying active all help. Diet is central: identifying trigger foods, getting the type of fibre right (soluble fibre such as oats is often better tolerated than insoluble bran), and, where symptoms persist, a trial of a low-FODMAP diet under the guidance of a dietitian. Some people find probiotics helpful.

When to get help

When to see a doctor

See your GP if you notice red-flag features — bleeding from the bottom, unexplained weight loss, a persistent change in bowel habit (especially over the age of 50), or symptoms that wake you at night — as these need investigation to exclude other conditions. Routine symptom flares can be discussed with your GP or pharmacist.

999Emergency — call 999 or go to A&E
111Urgent advice — call NHS 111 or use 111 online
GPNon-urgent — see your GP or pharmacist

Not sure how urgent it is? It is always OK to call NHS 111 for advice, day or night.

Answers

Irritable bowel syndrome (IBS): frequently asked questions

What medicines are used for irritable bowel syndrome?

Treatment targets the main symptom: antispasmodics for cramping pain, laxatives for constipation-predominant IBS, and antidiarrhoeals for diarrhoea-predominant IBS. For persistent pain and gut sensitivity, a low-intensity tricyclic antidepressant — or an SSRI as an alternative — can be used for its effect on the gut. Diet remains central alongside any medicine.

Why have I been offered an antidepressant when I am not depressed?

In IBS, a low-intensity course of a tricyclic antidepressant (or sometimes an SSRI) is used for its effect on gut pain and sensitivity through the gut-brain connection, not to treat depression. It works at a low intensity and is one of the options when pain persists despite other measures.

What can I do about my diet?

Regular meals, the right type of fibre (soluble fibre such as oats is often better tolerated than bran), and limiting common triggers help many people. If symptoms persist, a trial of a low-FODMAP diet — ideally with a dietitian — can identify foods that worsen your symptoms.

Will IBS turn into something more serious?

IBS does not damage the bowel or develop into bowel cancer. It is diagnosed only after red-flag symptoms have been excluded, which is why any bleeding, weight loss or new change in bowel habit should always be checked rather than assumed to be IBS.

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Sources

Where this is drawn from

  • NICE CG61: Irritable bowel syndrome in adults: diagnosis and management.
  • NICE CKS: Irritable bowel syndrome (IBS).

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