Medications for irritable bowel syndrome
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Overview of Medications for Irritable Bowel Syndrome (IBS)
Irritable bowel syndrome (IBS) is a common gastrointestinal disorder with symptoms like abdominal pain, constipation, diarrhea, or a mix of both. Medication choices depend on the predominant symptoms and individual patient needs. Several classes of medications are used, each targeting specific symptoms or underlying mechanisms Trinkley2014Chang2022Camilleri2017+2 MORE.
Medications for IBS with Constipation (IBS-C)
Secretagogues and Laxatives
For IBS-C, linaclotide is strongly recommended due to high-quality evidence supporting its effectiveness. Other options with moderate evidence include tenapanor, plecanatide, tegaserod, and lubiprostone. Polyethylene glycol laxatives are also used, though with lower certainty of benefit Chang2022Bonetto2021.
Fiber Supplements
Psyllium and bran are commonly recommended to improve constipation symptoms in IBS, with fiber supplementation having reliable evidence for benefit Trinkley2014Bonetto2021.
Medications for IBS with Diarrhea (IBS-D)
Antidiarrheals and Antibiotics
Loperamide is frequently used to manage diarrhea, though evidence is of very low certainty. Rifaximin, a non-absorbable antibiotic, and eluxadoline, a mixed opioid receptor agent, have moderate evidence supporting their use. Alosetron, a serotonin 5-HT3 antagonist, is also conditionally recommended Trinkley2014Lembo2022Bonetto2021.
Bile Acid Modulators
Bile acid sequestrants may be considered, especially in patients with bile acid malabsorption contributing to diarrhea .
Medications for Abdominal Pain and Spasms
Antispasmodics
Antispasmodic drugs, such as hyoscine butylbromide and dicyclomine, are effective and safe for managing abdominal pain and spasms in IBS. These are recommended in both international and local guidelines Trinkley2014Goncharenko2025Chang2022+1 MORE.
Peppermint Oil
Peppermint oil is supported by reliable evidence for reducing abdominal pain and discomfort in IBS patients Trinkley2014Rahimi2012.
Antidepressants and Central Acting Agents
Tricyclic antidepressants (TCAs) and selective serotonin reuptake inhibitors (SSRIs) can help with pain and overall IBS symptoms, though SSRIs are not recommended for all patients due to low certainty of benefit. Both classes have shown efficacy, particularly for patients with significant pain or coexisting mood symptoms Trinkley2014Chang2022Lembo2022+1 MORE.
Other and Emerging Therapies
GABA-Analogues and Novel Agents
Pregabalin and gabapentin, which act on GABA receptors, are being explored for their ability to reduce visceral pain. New drugs targeting neurotransmitter dysfunction, such as 5-HT3 antagonists and 5-HT4 agonists, are also under investigation Trinkley2014Sinagra2017Gros2021.
Herbal and Complementary Therapies
Peppermint oil is the most studied herbal remedy with proven benefit. Other herbal preparations are being explored, but evidence for most is limited or inconclusive Trinkley2014Rahimi2012.
Anti-inflammatory and Microbiota-Targeted Therapies
Rifaximin and mesalazine are being studied for their effects on low-grade inflammation in IBS. Probiotics and prebiotics are also under investigation, though their efficacy remains uncertain Trinkley2014Bonetto2021Sinagra2017.
Conclusion
The management of IBS is symptom-driven and often requires a personalized approach. Medications with the strongest evidence include linaclotide, rifaximin, lubiprostone, fiber supplements, and peppermint oil. Antispasmodics, antidepressants, and other agents may be used based on individual symptoms. Ongoing research continues to expand the range of therapeutic options for IBS, aiming to address the diverse needs of patients Trinkley2014Chang2022Camilleri2017+6 MORE.
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