Home Viberzi


Viberzi is a drug used to treat irritable bowel syndrome with diarrhea (IBS-D) in adults. The drug’s active ingredient is eluxadoline. The manufacturer of Viberzi, Allergan, received approval to sell the medication in the United States in 2015. In 2017, the U.S. Food and Drug Administration warned that the drug should not be prescribed to patients without a gallbladder due to a potential increased risk of serious adverse effects

Last Modified: September 5, 2023
Fact Checked
Medically Reviewed

Board-certified physicians medically review Drugwatch.com content to ensure its accuracy and quality.

Drugwatch.com partners with Physicians’ Review Network Inc. to enlist specialists. PRN is a nationally recognized leader in providing independent medical reviews.

Reviewer specialties include internal medicine, gastroenterology, oncology, orthopedic surgery and psychiatry.

Why Trust DrugWatch?

Drugwatch.com has been empowering patients for more than a decade

Drugwatch.com has provided reliable, trusted information about medications, medical devices and general health since 2008. We’ve also connected thousands of people injured by drugs and medical devices with top-ranked national law firms to take action against negligent corporations.

Our team includes experienced medical writers, award-winning journalists, researchers and certified medical and legal experts. Drugwatch.com is HONCode (Health On the Net Foundation) certified. This means the high-quality information we provide comes from credible sources, such as peer-reviewed medical journals and expert interviews.

The information on Drugwatch.com has been medically and legally reviewed by more than 30 expert contributors, including doctors, pharmacists, lawyers, patient advocates and other health care professionals. Our writers are members of professional associations, including American Medical Writers Association, American Bar Association, The Alliance of Professional Health Advocates and International Society for Medical Publication Professionals.

About Drugwatch.com

  • Assisting patients and their families since 2008.
  • Helped more than 12,000 people find legal help.
  • A+ rating from the Better Business Bureau.
  • 5-star reviewed medical and legal information site.
Learn More About Us


"Drugwatch opened my eyes to the realities of big pharmacy. Having a family member with major depression and anxiety, I was looking for information on her medications. I found information that was very helpful, that her psychiatrist never told her."
Marianne Zahren Patient’s Family Member
  • Google Business Rating
  • BBB A+ Rating Logo

Viberzi (eluxadoline) is a prescription drug marketed by Allergan for the treatment of irritable bowel syndrome with diarrhea (IBS-D). It belongs to a class of drugs known as mu-opioid receptor agonists.

The U.S. Food and Drug Administration originally approved the drug in 2015. Viberzi is the first and only prescription therapy in its drug class to treat IBS-D, according to Allergan’s Viberzi website, though there are other prescription options for the treatment of IBS-D available in other drug classes.

As of 2022, about 10 percent to 15 percent of the world’s population suffers from IBS, which is a chronic disease that causes abdominal pain or discomfort along with changes in defecation and bowel habits. In the United States, 25 million to 45 million people have IBS. IBS-D is a subtype of IBS that causes frequent diarrhea. Worldwide, about 40 percent of people with IBS have IBS-D.

Eluxadoline is a controlled Schedule IV substance.

Eluxadoline is a controlled Schedule IV substance, according to the U.S. Department of Justice and Drug Enforcement Administration. Some studies detailed in the drug’s label showed Viberzi has the potential for psychological dependence because it can produce feelings of euphoria in humans.

In 2018, the drug made $176.5 million for Allergan in the United States, according to the company’s 2018 Securities and Exchange Commission report.

The most common side effects of Viberzi include constipation, nausea and abdominal pain. The most common reasons patients stopped taking the drug during clinical trials were constipation and abdominal pain. Serious, but rare, side effects include pancreatitis and sphincter of Oddi spasms.

In 2017, the FDA released a drug safety communication that warned about an increased risk of pancreatitis in patients who do not have a gallbladder. This led some patients to file Viberzi lawsuits against Allergan.

How Does Eluxadoline Work?

In people with IBS-D, the intestines contract more than they should, especially after meals. This causes discomfort and diarrhea.

Viberzi works to control IBS-D symptoms by:

  • Reducing nerve sensitivity in the intestine
  • Slowing movement of food through the colon

In animal studies, Viberzi was active at three different kinds of opioid cell receptors: mu, delta and kappa. These receptors are also present in humans and work in the gut to affect muscle movements, sensations and secretions.

Scientists call it a mixed-opioid medication because it affects three receptors. Because of how it works, the medicine is less likely to cause constipation. It also works directly on receptors in the intestines, so it is less likely to cause additional central nervous system side effects.

Recommended Dosages

Viberzi is available in 75 mg and 100 mg tablets. The typical recommended dosage is 100 mg taken twice daily by mouth with food.

Doctors may recommend certain patients take 75 mg twice daily. These patients include those who:

  • Cannot tolerate 100 mg dose
  • Are also taking OATP1B1 inhibitors
  • Have mild or moderate liver impairment

Two doses should not be taken at the same time to make up for a missed dose. A doctor may recommend a patient stop treatment if he or she experiences side effects, such as severe constipation.

Drug Effectiveness and Interactions

Allergan tested Viberzi’s effectiveness in two clinical trial studies with 2,426 participants. The average patient age was 45 years old. A majority of the participants were white and two-thirds were female.

In these studies, scientists measured average worst abdominal pain and stool consistency in people taking eluxadoline and placebo.

In both trials, both doses of Viberzi resulted in improved pain and stool consistency scores when compared to patients that received placebo.

Compared with alosetron, another drug approved for IBS, eluxadoline has a lower potential for side effects and drug interactions, according to an article by pharmacists Fraidy Maltz and Brooke Fidler in Pharmacy and Therapeutics. But it has a similar side effect profile as the IBS-D drug rifaximin.

Potential for Abuse and Dependence

As a Schedule IV controlled substance, Viberzi has the potential for abuse. Though, the DEA considers the potential low compared to other controlled substances such as ketamine and codeine.

Animal studies in monkeys and rats did not produce behavioral signs of withdrawal, but monkeys wanted to self-administer the drug. In studies on monkeys, the animals chose to self-administer the drug “to a degree that was less than that of heroin but greater than that of saline,” according to the drug’s label.

Very few people reported feeling “euphoric” or “drunk” in clinical trials at dosages that are currently recommended. In two human abuse potential studies with doses that were up to 10 times the current recommended dose of Viberzi, patients experienced euphoria at a rate of 14 percent to 28 percent. By comparison, the rate was less than 5 percent among people who had taken a placebo and between 44 percent and 76 percent among people who had taken oxycodone.

“These data suggest that eluxadoline may produce psychological dependence,” according to the drug’s label.

Drug Interactions

Drugs that may interact with Viberzi include:

  • OATP1B1 inhibitors, such as cyclosporine, rifampin, gemfibrozil, eltrombopag, and antiretrovirals like ritonavir, saquinavir and tipranavir
  • Drugs that cause constipation, such as alosetron, anticholinergics and opioids
  • OATP1B1 and BCRP substrates, such as rosuvastatin

People Who Should Not Take Viberzi

The FDA approved Viberzi for use only in adults. It’s unknown whether the drug is safe or effective in children. While the drug works for most adults with IBS-D, some patients might react poorly to the medicine.

Patients without a gallbladderIncreased risk of developing serious adverse reactions of pancreatitis and/or sphincter of Oddi spasm
People with known or suspected biliary duct obstruction or sphincter of Oddi disease or dysfunctionIncreased risk for sphincter of Oddi spasm
Those who drink more than three alcoholic beverages per day, or suffer from alcoholism, abuse alcohol or alcohol addictionIncreased risk for acute pancreatitis
Patients with a history of pancreatitis; or structural diseases of the pancreas, including known or suspected pancreatic duct obstructionIncreased risk for acute pancreatitis
People with severe liver problemsRisk for significantly increased plasma concentrations of Viberzi
Those with a history of chronic or severe constipation, or known or suspected gastrointestinal obstructionRisk for severe complications of bowel obstruction
Patients with a known hypersensitivity reaction to the drugSerious hypersensitivity reactions, including anaphylaxis, can occur after the first or second dose
Source: Source: Viberzi’s FDA-approved drug label

Pregnancy and Breastfeeding

No studies have tested Viberzi in pregnant women, so it’s unknown how the drug affects expectant mothers and fetuses.

Eluxadoline was present in rat milk in animal studies. Before taking the drug, patients should tell their doctor if they are breastfeeding.

FDA Safety Alert

On March 15, 2017, the FDA warned in a safety communication that people who do not have a gallbladder should not use Viberzi.

From May 2015 through February 2017, the FDA Adverse Event Reporting System (FAERS) database received 120 reports of serious cases of pancreatitis or death in patients who had taken Viberzi. Patients in 76 of these cases needed hospitalization, and two patients died.

Gallbladder Illustration
The U.S. Food and Drug Administration warns patients who do not have a gallbladder not to take Viberzi. The above image is an illustration of a gallbladder.

In the patient that died from pancreatitis, the onset of symptoms was characterized by acute, severe abdominal pain, nausea, and vomiting within 60 minutes of taking a single dose of Viberzi. The cause of death associated with sphincter of Oddi spasm was characterized by severe abdominal pain and vomiting shortly after taking the first dose of Viberzi.

A total of 68 cases reported gallbladder status. Patients in 56 of the cases did not have a gallbladder and received the recommended dose of Viberzi.

Meanwhile, 84 cases noted when symptoms started. More than half said the serious cases of pancreatitis or death occurred after one or two doses of the drug.

The FDA said it was working with Allergan to address this safety issue.

Please seek the advice of a medical professional before making health care decisions.