On Sept. 17, 2025, The New England Journal of Medicine published the results from the OASIS 4 phase 3 trial that studied the efficacy and safety of the investigational once-daily oral semaglutide 25 mg (Wegovy^® in a pill), marking a significant milestone in the company’s ambition to advance obesity care.

In the 64-week trial, oral semaglutide 25 mg, alongside lifestyle modifications, was compared to placebo in 307 adults with obesity or overweight with one or more weight-related comorbidities, without diabetes.

Results showed that if all participants adhered to treatment, average weight loss of 16.6% was achieved by people taking oral semaglutide 25 mg compared to 2.7% for placebo at 64 weeks, with over a third (34.4%) experiencing a weight loss of 20% or more, versus 2.9% for placebo. This was comparable with previous trial results of injectable Wegovy^®.

When looking at the effect regardless of whether the participants took the medicine exactly as they should, people taking oral semaglutide 25 mg still achieved an average weight loss of 13.6% versus 2.2% with the placebo. Close to a third (29.7%) had a weight loss of 20% or more versus 3.3% for placebo. Additionally, the study also found that oral semaglutide 25 mg improved cardiovascular risk factors, as well as the ability to be more active in daily life, compared to placebo. This was consistent with previous trial results of injectable Wegovy^®.

The safety and tolerability profile of oral semaglutide was consistent with that for injectable Wegovy^®. In the OASIS 4 trial, gastrointestinal adverse events with oral semaglutide 25 mg were generally mild to moderate in severity and transient; the most common of which were nausea (46.6% versus 18.6% for placebo) and vomiting (30.9% versus 5.9% for placebo). Adverse events leading to permanent treatment discontinuation were 6.9% (oral semaglutide 25 mg) and 5.9% (placebo). The incidence of serious adverse events was 3.9% (oral semaglutide 25 mg) and 8.8% (placebo). This reinforces the safety and tolerability profile of semaglutide, as also demonstrated in more than 37 million patient-years of exposure.