U.S. Food and Drug Administration Issues Drug Safety Communication for IBS-D Medication Eluxadoline (Viberzi), March 2017

March 15, 2017

Today, March 15, 2017, IBS Impact learned via IFFGD social media that the U.S. Food and Drug Administration (FDA) issued a drug safety communication for eluxadoline (also known by the brand name Viberzi), currently used in treating irritable bowel syndrome with diarrhea in adults, 18 and older, both men and women. This warning applies specifically to people without a gallbladder, whom the FDA advises should not take eluxadoline (Viberzi). There is an apparent high risk of serious pancreatitis, which has resulted in many reported cases of hospitalization and two deaths.

According to the FDA warning notice issued today, as of February 2017, in the 21 months since eluxadoline’s FDA approval in May 2015, the FDA received 120 reports of serious pancreatitis or death. 76 of the 120 patients reported required hospitalization and 2 of them died. In 68 of the patients, it is known whether or not they had a gallbladder. 56 did not have a gallbladder, including the 2 individuals who died. 22 of the 120 cases of serious pancreatitis or death reported additional complications. As a result, the FDA is advising that those with IBS-D who do not have a gallbladder not be prescribed eluxadoline (Viberzi) at this time. For physicians, the drug safety communication includes several suggestions of alternative over-the-counter and prescription medications for IBS-D.

The FDA is working with the pharmaceutical company Allergan to address the safety concerns and urges patients and physicians to report any adverse events to the FDA.  There are no announced changes in safety concerns or recommendations regarding eluxadoline (Viberzi)  for those individuals who do have a gallbladder.

IBS Impact urges readers who have IBS-D and no gallbladder and are currently taking eluxadoline (Viberzi) to consult their physicians promptly. We advise anyone considering any specific IBS medication or treatment to read available evidence-based information, to familiarize themselves with the benefits and risks, and to consult their own doctors as if the given intervention is worth trying in their specific situations. IBS Impact focuses on awareness and advocacy and does not endorse particular interventions, but does encourage accurate and up to date information from reputable sources so that individuals with IBS and their families can make the most informed choices for their own needs and desires.


U.S. Food and Drug Administration Approves Eluxadoline and Rifaximin for IBS with Diarrhea

May 30, 2015

Earlier this week, on May 27, 2015, the U.S. Food and Drug Administration approved two new medications, eluxadoline (to be known by the brand name Virberzi) and rifaximin (known by the brand name Xifaxan)  for use in treating irritable bowel syndrome with diarrhea in adults, 18 and older, both men and women. Both medications have met the FDA’s safety and effectiveness standards and reduced symptoms of IBS-D for subsets of study volunteers in multiple large, double-blind, placebo controlled clinical trials. Neither Viberzi nor Xifaxan is approved for use in children, and there is no known information at this time regarding potential future availability in countries other than the United States.

Viberzi is an oral medication to be taken with food twice daily. It is a mixed opiod receptor agonist designed to lessen bowel contractions. There are several reported possible side effects and it is not appropriate for those with a history of bile duct obstruction, pancreatitis, severe liver impairment, severe constipation or those who consume more than three alcoholic drinks daily. As Virberzi is a narcotic, the FDA expects it to be classified as a controlled substance. It is manufactured by Panteon Pharmaceuticals and is to be distributed by Forest Laboratories. It is projected to be available for doctors to prescribe to patients by early 2016.

Xifaxan is an antibiotic that is not absorbed in the gut and is believed to change the bacterial composition of the gastrointestinal tract. It is meant to be taken by mouth three times daily for 14 days at a time. There are some risks of side effects, but it is generally considered safe, although it also should not be used by those with severe liver impairments or along with certain other medications. In addition, research shows an eventual relapse rate of almost two-thirds among volunteers in the most recent Xifaxan clinical trials. In those individuals for whom IBS-D symptoms return after use of Xifaxan, the FDA has deemed up to two 14 day periods of re-treatment appropriate.

This was second application for approval of Xifaxan for IBS-D. In 2011, the FDA denied the first request, citing concerns about the high relapse rate and requesting more studies. Xifaxan is currently available in the United States for other conditions, and has been prescribed “off label” for use in IBS-D by some physicians. While this practice is legal, this week’s official approval for use in IBS-D will allow Salix Pharmaceuticals to market the medication specifically for irritable bowel syndrome with diarrhea, thereby presumably increasing availability and awareness among physicians and people with IBS-D. Further details on this approval can be found at the reputable links below.

The original FDA press release about Virberzi and Xifaxan.

International Foundation for Functional Gastrointestinal Disorders (IFFGD) summary on Virberzi

IFFGD summary on Xifaxan

Lengthy, detailed article with sources, “New Meds OK’d for Hard-to-Treat IBS With Diarrhea” by Kathleen Doheny, WebMD Health News, May 28, 2015

As many in the IBS community are aware, FDA-approved prescription medications specifically for irritable bowel syndrome of any subtype are extremely limited, and no single treatment, whether it is medication, diet, psychological interventions, or others, proves appropriate or effective for every individual with IBS, even those with similar symptom patterns. The only prescription drug specifically for IBS with diarrhea, alosetron (Lotronex), was approved for use only in women with IBS-D in 2000 but was quickly withdrawn from the market within months due to reports of serious side effects including several deaths. According to The New York Times at the time, in 2002, after advocacy from the IBS community, Lotronex was reintroduced only under significant restrictions for use in those women with very severe IBS-D for whom no other treatments are effective. IBS Impact is pleased that those with diarrhea-predominant IBS will soon have two safer and more widely available options in Viberzi and Xifaxan, and hopes that research on these two medications and others in development will continue.

We urge those who are considering either Viberzi or Xifaxan to read the available information, to familiarize themselves with the benefits and risks and to consult their own doctors as to if either medication is worth trying in their specific situations. IBS Impact focuses on awareness and advocacy and does not endorse particular treatments, but does encourage accurate and up to date information from reputable sources so that individuals with IBS and their families can make the most informed choices for their own needs and desires.