In company-funded studies, participants taking Wegovy had average weight loss of 15%, about 34 pounds (15.3 kilograms). Participants lost weight steadily for 14 months before plateauing. In a comparison group getting dummy shots, the average weight loss was about 2.5%, or just under 6 pounds.
“With existing drugs, you’re going to get maybe 5% to 10% weight reduction, sometimes not even that,” said Dr. Harold Bays, medical director of the Louisville Metabolic and Atherosclerosis Research Center. Bays, who is also the Obesity Medicine Association’s chief science officer, helped run studies of the drug.
In the U.S., more than 100 million adults — about 1 in 3 — are obese.
Bays said Wegovy appears far safer than earlier obesity drugs that “have gone down in flames” over safety problems. Wegovy’s most common side effects were gastrointestinal problems, including nausea, diarrhea and vomiting. Those usually subsided, but led about 5% of study participants to stop taking it.
The drug carries a potential risk for a type of thyroid tumor, so it shouldn’t be taken by people with a personal or family history of certain thyroid and endocrine tumors. Wegovy also has a risk of depression and pancreas inflammation.
Wegovy (pronounced wee-GOH’-vee) is a synthesized version of a gut hormone that curbs appetite. Patients inject it weekly under their skin. Like other weight-loss drugs, it’s to be used along with exercise, a healthy diet and other steps like keeping a food diary.
The Danish company hasn’t disclosed Wegovy’s price but said it will be similar to the price of its Saxenda, a weight loss drug injected daily that now typically costs more than $1,300 per month without insurance.