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Victoza Side Effects

Common side effects of the Type 2 diabetes drug Victoza include nausea, diarrhea and vomiting. Nausea was the most reported side effect in clinical trials and in postmarketing reports submitted to the U.S. Food and Drug Administration. Studies also link the drug to serious problems such as pancreatitis and gallbladder disease.

Victoza (liraglutide injection) is a once-a-day injectable medication for Type 2 diabetes. The most common side effects of the drug are gastrointestinal problems such as nausea, vomiting and diarrhea. In clinical trials, these reactions occurred in 5 percent or more of patients who took the drug.

Common side effects of Victoza include:
  • Nausea
  • Diarrhea
  • Headache
  • Nasopharyngitis
  • Vomiting
  • Decreased appetite
  • Dyspepsia (indigestion)
  • Upper respiratory tract infection
  • Constipation
  • Back pain
  • Hypoglycemia
  • Injection site reactions

In addition to common side effects, Victoza’s medication label warns about a few serious side effects. People with existing kidney problems who take the medication may experience worsening of kidney failure. The drug may increase the risk of pancreatitis and gallbladder disease. It also carries a black box warning — the FDA’s most serious warning — for the risk of thyroid cancer.

According to the U.S. Food and Drug Administration’s Adverse Events Reporting System (FAERS), there were 30,740 reports of adverse events associated with the medication from 2010 to Sept. 30, 2019. This included 10,967 serious cases, and 917 of those were deaths.

FAERS data is postmarketing data which means it comes from real-world clinical practice as opposed to clinical trials, where researchers carefully select patients to receive a drug.

Because FAERS is voluntary reporting, researchers say side effects are underreported. But it also means there is no way to verify that a drug actually caused the side effect. In the case of Victoza, the most reported side effect in clinical trials — nausea — is also one of the most reported side effects in FAERS.

The medication may have one desirable side effect for Type 2 diabetes patients: decreased appetite. People take in fewer calories because the drug decreases appetite and this may lead to weight loss.

Risk of Pancreatitis

In March 2013, an FDA Drug Safety Communication warned that several Type 2 diabetes drugs including Victoza may increase the risk of pancreatitis. The FDA also flagged some data that suggests precancerous changes to the pancreas.

Lawsuits over Victoza say the drug’s faulty formulation increased the chances of developing pancreatic cancer, and the drug’s manufacturer failed to adequately warn of the risk. The drug’s prescribing information does not include information on pancreatic cancer.

Though pancreatitis is a rare side effect of the medicine, the FDA still requires a warning on the drug’s medication label. Some studies made a connection between pancreatitis and Victoza’s active ingredient, liraglutide. Researchers also described some individual patient cases.

Illustration of acute pancreatitis
Victoza’s medication insert warns that the drug may increase the risk of pancreatitis.

A review published in June 2015 in Diabetes Care looked at clinical trial data on liraglutide and pancreatitis. Researchers found more people on liraglutide suffered pancreatitis than people who took other diabetes drugs. People who took liraglutide had 2.1 times the risk compared to other diabetes drugs in the trials.

An earlier paper published in 2011 in the International Journal of Clinical Pharmacology reviewed eight clinical studies and found six cases of pancreatitis and five cases of cancer in patients who took liraglutide. Cancer types reported included pancreas, lung, thyroid, and epiglottis.

Did You Know?
From 2010 to Sept. 30, 2019, FAERS received more than 2,500 reports of Victoza users who suffered pancreatic disorders. There were more than 50 deaths.
Source: FDA Adverse Events Reporting System (FAERS) Public Dashboard

More recently, in a 2018 case report by Quesada-Vazquez and colleagues, researchers reported the case of a 44-year-old woman who had abdominal pain with nausea and vomiting. They examined her and determined she had pancreatitis from taking liraglutide at a dose used for weight loss.

Doctors admitted her to the hospital, discontinued the drug, and gave her intravenous fluids and painkillers. After four days, signs and symptoms of pancreatitis began to resolve.

Thyroid Cancer

Victoza has a black box warning for the risk of thyroid C-cell tumors, including medullary thyroid carcinoma (MTC), a rare and difficult-to-treat type of thyroid cancer.

The drugmaker placed the warning on the medication based on animal studies that showed mice exposed to liraglutide developed tumors, and researchers don’t actually know how this will affect humans.

From 2010 to Sept. 30, 2019, FAERS received over 250 reports of various thyroid cancers in Victoza users, including 27 cases of MTC that included two deaths.

Thyroid Cancer
Liraglutide has been shown to cause thyroid C-cell tumors when taken at high doses.

Dr. Michael A. Nauck and Nele Friedrich described the connection between liraglutide, as well as other medications in the same drug class, and thyroid cancer in the journal Diabetes Care in August 2013. Some mice and rats given injections of liraglutide had increased C-cell abnormalities that led to tumors.

The authors noted that human C-cells may not respond the same way. They looked at studies where humans received liraglutide for up to 52 weeks with doses ranging from 1.8 mg to 3 mg daily, and there was no indication that C-cells changed.

Still, authors could not say for sure that liraglutide did not cause thyroid cancer. They urged caution in people with a higher risk for thyroid cancer.

The medication label for Victoza states that patients with a history of medullary thyroid cancer or Multiple Endocrine Neoplasia syndrome type 2, a type of thyroid cancer, should not use the medication. Patients with a family history of thyroid cancer are also at high risk of developing thyroid tumors and should not use the medication.

Gallbladder Problems

Victoza’s drug label warns that clinical trials found some patients who took the drug suffered acute gallbladder disease. Most of these people required hospitalization and/or gallbladder removal.

According to the clinical trial data, 3.1 percent of the 4,666 patients who took Victoza suffered gallbladder disease compared to 1.9 percent of the 4,672 placebo-treated patients.

Researchers have theories about how the medication may affect the gallbladder. A 2018 study in Diabetes, Obesity and Metabolism showed liraglutide slowed the process of bile leaving the gallbladder. If the bile builds up in the gallbladder, it can cause inflammation and infection, a condition known as cholecystitis.

Several studies have shown that liraglutide and other medications in the same drug class may increase gallstone production.

From 2010 to Sept. 30, 2019, more than 450 reports of gallbladder or biliary tract disease were reported to FAERS in Victoza users. The majority were considered serious.
Source: FDA Adverse Events Reporting System (FAERS) Public Dashboard

A 2017 RxFiles Trial Summary of the Liraglutide: Cardiovascular (CV) Outcomes and Mortality in Patients with Type 2 Diabetes (T2DM) (LEADER) trial found there will be one extra case of gallbladder disease for every 100 patients who use Victoza.

Authors Rebecca Stan and colleagues said the LEADER trial was the largest and longest trial for liraglutide to date, but it only lasted 3.5 to 5 years and had weaknesses. People who dropped out of the trial because of severe adverse events were “censored,” or not included in final analysis, so trial researchers could have missed important side effects. Also, Novo Nordisk, Victoza’s manufacturer, funded the trial.

Victoza Pen
Victoza Side Effects
  1. Black Box Warning Thyroid C-cell tumors
  2. Most Reported Side Effect In Clinical Trails 18 percent to 20 percent of clinical trial participants suffered nausea; this number increases when Victoza is combined with other antidiabetic drugs
  3. Beneficial Side Effect Decreased appetite may happen while on Victoza, leading to weight loss. Some providers say this is an advantage for people with Type 2 diabetes, and a formulation of liraglutide, the active ingredient in Victoza, is available for weight loss in patients with obesity.

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

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Michelle Llamas, Senior Content Writer
Written By Michelle Llamas Senior Writer

Michelle Llamas has been writing articles and producing podcasts about drugs, medical devices and the FDA for nearly a decade. She focuses on various medical conditions, health policy, COVID-19, LGBTQ health, mental health and women’s health issues. Michelle collaborates with experts, including board-certified doctors, patients and advocates, to provide trusted health information to the public. Some of her qualifications include:

  • Member of American Medical Writers Association (AMWA) and former Engage Committee and Membership Committee member
  • Centers for Disease Control and Prevention (CDC) Health Literacy certificates
  • Original works published or cited in The Lancet, British Journal of Clinical Pharmacology and the Journal for Palliative Medicine
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  2. U.S. Food and Drug Administration. (2013, March 14). FDA Drug Safety Communication: FDA investigating reports of possible increased risk of pancreatitis and pre-cancerous findings of the pancreas from incretin mimetic drugs for type 2 diabetes. Retrieved from
  3. Nauck, M.A. & Friedrich, N. (2013). Do GLP-1–Based Therapies Increase Cancer Risk? Retrieved from
  4. Smits, M.M. et al. (2016). Biliary effects of liraglutide and sitagliptin, a 12‐week randomized placebo‐controlled trial in type 2 diabetes patients. Retrieved from
  5. Novo Nordisk. (2019). Possible side effects of Victoza. Retrieved from
  6. Nexøe-Larsen, C.C. et al. (2018). Effects of liraglutide on gallbladder emptying: A randomized, placebo-controlled trial in adults with overweight or obesity. Retrieved from
  7. Stan, R. et al. (2017). RxFiles Summary: LEADER: Liraglutide VICTOZA CV Outcomes Trial Summary. Liraglutide: Cardiovascular (CV) Outcomes and Mortality in Patients with Type 2 Diabetes (T2DM). Retrieved from
  8. Jeong, K-H & Yoo, B.K. (2011, September 28). The efficacy and safety of liraglutide. Retrieved from
  9. U.S. Food and Drug Administration. (n.d.). FDA Adverse Event Reporting System (FAERS) Public Dashboard. Retrieved from
  10. Jensen, T.M. et al. (2015). Is There a Link Between Liraglutide and Pancreatitis? A Post Hoc Review of Pooled and Patient-Level Data From Completed Liraglutide Type 2 Diabetes Clinical Trials. Retrieved from
  11. Quesada-Vazquez, N. et al. (2018). A Case of Acute Pancreatitis Due to Liraglutide. Retrieved from
  12. Flint, A. et al. (1998). Glucagon-like peptide 1 promotes satiety and suppresses energy intake in humans. Retrieved from
  13. Pi-Sunyer, X. et al. (2015). A randomized, controlled trial of 3.0 mg of liraglutide in weight management. Retrieved from
  14. Pizzimenti, V. et al. (2016). Incretin-based therapy and acute cholecystitis: a review of case reports and EudraVigilance spontaneous adverse drug reaction reporting database. Retrieved from
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