Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 18 peer-reviewed journal articles Updated
Gastroenterology

Guidelines for Care: Standard IBS Treatments

At a Glance

Irritable Bowel Syndrome (IBS) is effectively managed using a personalized, multi-pronged approach that targets both bowel habits and gut-brain sensitivity. Standard treatments include soluble fiber, targeted medications for constipation or diarrhea, and the structured low-FODMAP diet.

Managing Irritable Bowel Syndrome (IBS) has evolved into a highly personalized process guided by the latest standards from the American College of Gastroenterology (ACG) and the American Gastroenterological Association (AGA). Because IBS is a disorder of how the gut and brain communicate, effective treatment often requires a “multi-pronged” approach that addresses both the physical bowel habits and the underlying nerve sensitivity [1].

First-Line Treatments and Symptom Management

Before moving to advanced prescriptions, the ACG guidelines strongly recommend foundational and over-the-counter (OTC) therapies to stabilize your symptoms [1]:

  • Soluble Fiber: Supplements like psyllium husk are highly recommended as a first-line treatment to regulate bowel movements and improve global IBS symptoms. This is preferred over insoluble fiber (like bran), which can sometimes worsen bloating [1].
  • Antispasmodics: Medications like dicyclomine or peppermint oil help relax the smooth muscles in the gut, which can significantly reduce cramping and abdominal pain [2][3].
  • OTC Regulators: For IBS-C, Polyethylene glycol (PEG) laxatives can help with constipation. For IBS-D, loperamide can help slow down diarrhea. While these help with bowel habits, they do not generally improve the abdominal pain associated with IBS [2][3].

Guideline-Based Prescription Medications

If first-line options do not provide enough relief, medical guidelines recommend specific medications based on your IBS subtype. These target “global” symptoms—meaning they help with both abdominal pain and bowel habits [4].

Treatments for IBS-C (Constipation)

  • Strongest Recommendation: Linaclotide is currently the only medication for IBS-C with a “strong” recommendation and high-certainty evidence for its effectiveness [2].
  • Other Options: Plecanatide and Lubiprostone are also supported for improving global symptoms [2]. Tenapanor is a newer option that works differently by reducing sodium absorption in the gut [4].

Treatments for IBS-D (Diarrhea)

  • Rifaximin: A non-systemic antibiotic (meaning it stays in the gut and is not absorbed into the blood) that is taken for two weeks. It can be repeated if symptoms return [5][6].
  • Eluxadoline: This medication helps slow down the gut and reduce pain. Important Note: It is strictly contraindicated for anyone who has had their gallbladder removed, as it can cause severe complications [5][7].
  • Alosetron: This is reserved for women with severe IBS-D that has not responded to other treatments [5].

Addressing the Brain-Gut Axis

Because the core of IBS is visceral hypersensitivity (over-sensitive gut nerves), medications that target the nervous system are often used. These are called neuromodulators [8].

  • Tricyclic Antidepressants (TCAs): When used for IBS, drugs like amitriptyline are prescribed at much lower doses than what is used for depression [9]. They work by “turning down the volume” on pain signals from the gut [10]. They are especially helpful for IBS-D because one of their side effects is mild constipation [11].
  • Gut-Directed Therapy: Psychological approaches like Cognitive Behavioral Therapy (CBT) and gut-directed hypnotherapy are evidence-based treatments that help the brain better manage the signals it receives from the digestive system [1][12].

The Role of Diet

The low-FODMAP diet is recommended as a short-term, first-line intervention [13]. It involves temporarily reducing certain types of carbohydrates (FODMAPs) that ferment in the gut and cause gas and bloating [14].

  • The Three Phases: It consists of an Elimination phase (strictly removing FODMAPs for 4-6 weeks), a Reintroduction phase (slowly testing specific groups to see what you tolerate), and a Personalization phase (eating as broadly as possible while avoiding only your confirmed triggers) [15][16].
  • When to Expect Relief: Many patients notice a reduction in bloating and pain within the first 1 to 2 weeks of the elimination phase [17].
  • Expert Guidance: Because it is restrictive, it is best done under the supervision of a specialized dietitian to ensure you don’t miss out on essential nutrients [18].

Common questions in this guide

What is the most effective medication for IBS with constipation (IBS-C)?
Linaclotide is currently the only medication with a strong recommendation from major gastroenterology guidelines for treating IBS-C. It helps improve both abdominal pain and overall bowel habits.
Can I take eluxadoline for IBS-D if I do not have a gallbladder?
No, eluxadoline is strictly contraindicated for anyone who has had their gallbladder removed. Taking it without a gallbladder can cause severe medical complications, so your doctor will need to explore alternative medications for diarrhea.
Why would my doctor prescribe an antidepressant for my IBS?
Tricyclic antidepressants are prescribed at very low doses to act as neuromodulators, helping to calm oversensitive nerves in your gut. At these low doses, they are used to turn down the volume on abdominal pain signals rather than to treat depression.
How long does the low-FODMAP diet take to work?
Many patients start to notice a reduction in bloating and abdominal pain within the first one to two weeks of the strict elimination phase. The initial elimination phase typically lasts four to six weeks before you begin slowly reintroducing foods.
What over-the-counter remedies are best for starting IBS treatment?
Soluble fiber, such as psyllium husk, is highly recommended as a first-line treatment to regulate bowel movements. Over-the-counter antispasmodics like peppermint oil can also significantly reduce cramping and abdominal pain.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on the 2021/2022 guidelines, am I a candidate for a 'strong recommendation' drug like linaclotide?
  2. 2.If we consider eluxadoline for my diarrhea, what precautions do we need to take since I still have my gallbladder?
  3. 3.Could a low-dose tricyclic antidepressant help manage my abdominal pain, and what side effects should I watch for?
  4. 4.Do you have a specialized dietitian you recommend to guide me through the three phases of the low-FODMAP diet?
  5. 5.Would gut-directed hypnotherapy or CBT be a good addition to my medication plan to help with my visceral hypersensitivity?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (18)
  1. 1

    ACG Clinical Guideline: Management of Irritable Bowel Syndrome.

    Lacy BE, Pimentel M, Brenner DM, et al.

    The American journal of gastroenterology 2021; (116(1)):17-44 doi:10.14309/ajg.0000000000001036.

    PMID: 33315591
  2. 2

    AGA Clinical Practice Guideline on the Pharmacological Management of Irritable Bowel Syndrome With Constipation.

    Chang L, Sultan S, Lembo A, et al.

    Gastroenterology 2022; (163(1)):118-136 doi:10.1053/j.gastro.2022.04.016.

    PMID: 35738724
  3. 3

    AGA Clinical Practice Guideline on the Pharmacological Management of Irritable Bowel Syndrome With Diarrhea.

    Lembo A, Sultan S, Chang L, et al.

    Gastroenterology 2022; (163(1)):137-151 doi:10.1053/j.gastro.2022.04.017.

    PMID: 35738725
  4. 4

    Focus on Pharmacotherapy for Irritable Bowel Syndrome with Constipation.

    Liu JJ, Brenner DM

    Gastroenterology clinics of North America 2021; (50(3)):639-653 doi:10.1016/j.gtc.2021.04.004.

    PMID: 34304792
  5. 5

    Current US Food and Drug Administration-Approved Pharmacologic Therapies for the Treatment of Irritable Bowel Syndrome with Diarrhea.

    Brenner DM, Sayuk GS

    Advances in therapy 2020; (37(1)):83-96 doi:10.1007/s12325-019-01116-z.

    PMID: 31707713
  6. 6

    Repeat Treatment With Rifaximin Is Safe and Effective in Patients With Diarrhea-Predominant Irritable Bowel Syndrome.

    Lembo A, Pimentel M, Rao SS, et al.

    Gastroenterology 2016; (151(6)):1113-1121 doi:10.1053/j.gastro.2016.08.003.

    PMID: 27528177
  7. 7

    Eluxadoline-induced Recurrent Pancreatitis in a Young Female without a Gallbladder: A Case Report and Literature Review.

    Khetpal N, Yadav L, Khalid S, Kumar R

    Cureus 2018; (10(12)):e3747 doi:10.7759/cureus.3747.

    PMID: 30820368
  8. 8

    Review Article: Current and future treatment approaches for IBS with diarrhoea (IBS-D) and IBS mixed pattern (IBS-M).

    Nee J, Lembo A

    Alimentary pharmacology & therapeutics 2021; (54 Suppl 1()):S63-S74 doi:10.1111/apt.16625.

    PMID: 34927757
  9. 9

    Low-dose titrated amitriptyline as second-line treatment for adults with irritable bowel syndrome in primary care: the ATLANTIS RCT.

    Wright-Hughes A, Ford AC, Alderson SL, et al.

    Health technology assessment (Winchester, England) 2024; (28(66)):1-161 doi:10.3310/BFCR7986.

    PMID: 39397570
  10. 10

    A survey of gastroenterologists in the United States on the use of central neuromodulators for treating irritable bowel syndrome.

    Nulsen B, LeBrett W, Drossman DA, Chang L

    Alimentary pharmacology & therapeutics 2021; (54(3)):281-291 doi:10.1111/apt.16467.

    PMID: 34148256
  11. 11

    Central Neuromodulators in Irritable Bowel Syndrome: Why, How, and When.

    Hanna-Jairala I, Drossman DA

    The American journal of gastroenterology 2024; (119(7)):1272-1284 doi:10.14309/ajg.0000000000002800.

    PMID: 38595149
  12. 12

    Pharmacologic, Dietary, and Psychological Treatments for Irritable Bowel Syndrome With Constipation: Cost Utility Analysis.

    Shah ED, Salwen-Deremer JK, Gibson PR, et al.

    MDM policy & practice 2021; (6(1)):2381468320978417 doi:10.1177/2381468320978417.

    PMID: 33521290
  13. 13

    [Is the diet low in FODMAP really effective and safe for irritable bowel syndrome?: A scoping review].

    Sebastián Domingo JJ, Sánchez Sánchez C

    Semergen 2020; (46(8)):566-576 doi:10.1016/j.semerg.2020.07.010.

    PMID: 33153877
  14. 14

    Low Fermentable Oligo- Di- and Mono-Saccharides and Polyols (FODMAPs) or Gluten Free Diet: What Is Best for Irritable Bowel Syndrome?

    Bellini M, Tonarelli S, Mumolo MG, et al.

    Nutrients 2020; (12(11)) doi:10.3390/nu12113368.

    PMID: 33139629
  15. 15

    All FODMAPs Aren't Created Equal: Results of a Randomized Reintroduction Trial in Patients With Irritable Bowel Syndrome.

    Eswaran S, Jencks KJ, Singh P, et al.

    Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association 2025; (23(2)):351-358.e5 doi:10.1016/j.cgh.2024.03.047.

    PMID: 38729390
  16. 16

    Low fermentable oligosaccharide, disaccharide, monosaccharide, and polyol diet in patients with diarrhea-predominant irritable bowel syndrome: A prospective, randomized trial.

    Goyal O, Batta S, Nohria S, et al.

    Journal of gastroenterology and hepatology 2021; (36(8)):2107-2115 doi:10.1111/jgh.15410.

    PMID: 33464683
  17. 17

    Effects of a Low-FODMAP Diet on Irritable Bowel Syndrome in Both Children and Adults-A Narrative Review.

    Morariu ID, Avasilcai L, Vieriu M, et al.

    Nutrients 2023; (15(10)) doi:10.3390/nu15102295.

    PMID: 37242178
  18. 18

    Long-term personalized low FODMAP diet improves symptoms and maintains luminal Bifidobacteria abundance in irritable bowel syndrome.

    Staudacher HM, Rossi M, Kaminski T, et al.

    Neurogastroenterology and motility 2022; (34(4)):e14241 doi:10.1111/nmo.14241.

    PMID: 34431172

This page is for informational purposes only and does not replace professional medical advice. Always consult your gastroenterologist to determine the safest and most effective IBS treatment plan for your specific subtype.

Get notified when new evidence is published on irritable bowel syndrome.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.