Is there a long-term medication plan for IBS-D?

Question

Hello doctor,

I am 38 years old and was diagnosed with IBS-D about two years ago, but it has become much worse in the last few months. I am having up to eight to ten loose bowel movements per day, and the urgency is so sudden that I have had several accidents at work. I now carry a change of clothes every single day.

My gastroenterologist performed a colonoscopy, which came back normal, and my calprotectin was 45 ug/g, which she said rules out inflammatory bowel disease. I started on Rifaximin 550 mg twice daily for two weeks and felt better for about three weeks, but then the symptoms returned.

My nutritionist put me on a low FODMAP diet, and while some foods, such as onions and garlic, clearly trigger my symptoms, removing everything has not solved the core problem. I am also under a lot of pressure at work, and my psychologist thinks the IBS-D has a strong gut-brain connection in my case.

I have lost 4 kg in three months, and my ferritin is now 9 ng/mL, which my physician says indicates iron deficiency. The constant need to use the restroom is making it impossible to travel or even attend meetings.

Is there a longer-term medication plan for IBS-D? Rifaximin provides only temporary relief, and a low-FODMAP diet alone is insufficient.

Kindly guide me on this.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I understand your concern.

Your symptoms are consistent with irritable bowel syndrome with diarrhea predominance (IBS-D), and your normal colonoscopy with a low fecal calprotectin makes inflammatory bowel disease unlikely. IBS-D often fluctuates and can worsen during periods of stress because of the strong gut–brain connection, where stress signals increase intestinal motility and sensitivity.

The temporary response to Rifaximin is common. In selected patients, the course can be repeated, as studies show some benefit from retreatment when symptoms recur. However, long-term control usually requires a broader plan.
Several medication options may help reduce stool frequency and urgency. Drugs such as Eluxadoline can slow intestinal movement and reduce diarrhea. Low-dose neuromodulator medicines such as Amitriptyline are sometimes used in IBS-D because they reduce gut nerve sensitivity and help control urgency. Antidiarrheal medicines like Loperamide may still be used before travel or important events.
Dietary management remains useful but does not cure IBS. Continuing a modified low-FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) approach that identifies specific triggers (such as onion or garlic) rather than strict long-term restriction is usually recommended.

Your iron deficiency (ferritin 9) also needs attention, which may relate to dietary restriction or chronic diarrhea; iron supplementation and monitoring should be discussed with your physician.

Because stress clearly worsens symptoms, psychological therapies such as cognitive behavioral therapy, relaxation training, or gut-directed hypnotherapy can significantly improve IBS severity.

IBS-D does not damage the intestine, but severe symptoms can greatly affect the quality of life. With a combined strategy targeted to medication, dietary adjustments, treatment of iron deficiency, and stress management, many patients achieve much better long-term symptom control and regain normal daily activities.

I hope this helps.

Kindly follow up if you have more concerns.

Thank you.