Management of Loose Stool and Abdominal Pain

First-Line Treatments

The American Gastroenterological Association recommends loperamide for diarrhea control and antispasmodics for pain relief, along with dietary modifications and adequate hydration for patients with loose stool and abdominal pain 1, 2
Loperamide (2-4 mg, up to four times daily) is effective for reducing loose stools, urgency, and fecal soiling, but should be titrated carefully to avoid side effects such as constipation, bloating, nausea, and abdominal pain 3
Antispasmodics (anticholinergic agents) are effective for abdominal pain, particularly when symptoms are exacerbated by meals, though dry mouth, visual disturbance, and dizziness are common side effects 1, 4
Peppermint oil can be effective for global symptoms and abdominal pain, though gastro-esophageal reflux is a common side effect 5
Regular exercise should be advised for all patients with irritable bowel symptoms 1
Soluble fiber (such as ispaghula/psyllium) should be started at a low dose (3-4 g/day) and gradually increased to avoid bloating; it's effective for global symptoms and abdominal pain 1
Insoluble fiber (e.g., wheat bran) should be avoided as it may exacerbate symptoms 1

Tricyclic antidepressants (TCAs) are effective second-line treatments for global symptoms and abdominal pain when first-line treatments fail, starting at low doses (e.g., 10 mg amitriptyline once daily) and titrating slowly to 30-50 mg once daily 1, 5
Selective serotonin reuptake inhibitors (SSRIs) may be effective as second-line treatment for global symptoms, particularly for patients with comorbid anxiety disorders 1, 3
Eluxadoline can be used in secondary care for diarrhea-predominant symptoms but is contraindicated in patients with prior sphincter of Oddi problems, cholecystectomy, alcohol dependence, pancreatitis, or severe liver impairment 1, 5
5-HT3 receptor antagonists (such as ondansetron, titrated from 4 mg once daily to maximum 8 mg three times daily) are efficacious second-line drugs for diarrhea-predominant symptoms 1, 5
Cholestyramine may benefit patients with cholecystectomy or those who may have bile acid malabsorption 3, 6

A low FODMAP diet can be considered as second-line dietary therapy for global symptoms and abdominal pain, but implementation should be supervised by a trained dietitian with gradual reintroduction of FODMAPs according to tolerance 1, 7
First-line dietary advice should be offered to all patients, focusing on regular meals and adequate fluid intake 1, 2
Food elimination diets based on IgG antibodies are not recommended 1
A gluten-free diet is not routinely recommended unless celiac disease is confirmed 1
Psychological treatments (cognitive-behavioral therapy, dynamic psychotherapy, hypnosis, stress management) should be considered when symptoms significantly impair quality of life or when there are associated psychological disorders 3, 8
Symptom monitoring using a diary may help identify possible triggers to symptom exacerbation 3, 6

Complete symptom resolution is often not achievable; managing patient expectations is important 2, 7
Exclude organic disorders that can mimic IBS symptoms, such as celiac disease, before initiating treatment 2