Regulators are looking into whether weight-loss drugs like Ozempic raise the risk of suicidal thoughts

The European Medicines Agency started investigating the issue in July after reports of suicidal thoughts and self-harm from people who had been taking the anti-obesity drugs. The review is focused on so-called GLP-1 treatments, a class that includes Novo’s Wegovy weight-loss shot as well as its diabetes medicine Ozempic. The drugs are among the hottest sellers in pharma.

In a statement Friday, the EMA’s safety committee said it had reviewed all clinical trial evidence and published literature on the subject, adding: “While at this point no conclusion can be drawn on a causal association, there are several issues that still need to be clarified.” 

The committee has agreed further lists of questions to be addressed by the makers of these medicines and said it will discuss the topic again at its meeting in April. 

Though their use for weight loss is comparatively recent, GLP-1 drugs have a more than 15-year history as treatments for diabetes. The EMA investigation also includes dulaglutide, the active ingredient in Lilly’s diabetes medicine Trulicity, and AstraZeneca Plc’s diabetes drug Byetta.

“Patient safety is Lilly’s top priority,” a spokesperson for the company told Bloomberg Friday. “We will continue to respond to the regulatory reviews regarding safety signals related to dulaglutide as part of our routine regulatory review processes.”