Aspirin has long been prescribed to prevent heart attacks. Now experts say it shouldn’t.

Low doses of aspirin have long been used as a preventative tool against cardiovascular disease. Past research has shown that daily aspirin use can lower the chances of having your first heart attack or stroke in certain populations. But the regimen is not without risks, and now new recommendations suggest doctors rethink its use for this purpose.

In a draft statement, the US Preventive Services Task Force, an independent group of experts that advise on disease prevention and evidence-based medicine, have updated their recommendations, saying that for older adults, pre-emptively taking aspirin is not worth the risks. Specifically, the panel states that while starting on aspirin to prevent the onset of heart disease may be beneficial to younger adults (aged 40 to 59) on a case by case basis, adults aged 60 and older should not start the regimen. The risks of serious side effects for them, including bleeding in the stomach, intestines, and brain, aren’t worth the potential benefits, the panel states.

Aspirin thins the blood, which can help reduce the incidents of cardiovascular disease, but comes with its own risk such as an increase in bleeding.

The task force clarifies that its new recommendations only apply to those who have never had a heart attack or stroke before, and are not already regularly taking aspirin. But if you are 60 or older and have no history of cardiovascular disease, you should not begin on aspirin.

“At that point, the higher risk of bleeding with age actually cancels out the potential benefit of aspirin,” Chien-Wen Tseng, a member of the task force and the research director of family medicine and community health at the University of Hawaii, told The Washington Post.