Federal health regulators have approved a drug to reverse the blood-thinning effects of the popular pill Pradaxa, which has been subject to thousands of reports of severe bleeding.

The Food and Drug Administration says the new drug, Praxbind, is an injection that neutralizes the effects of Pradaxa. Patients may need to halt blood thinning if they are injured or require emergency surgery.

The original drug, from Boehringer Ingelheim, was approved in 2010 to reduce the stroke risk in patients with , or . But unlike other blood-thinning medications, there was previously no antidote to stop the drug's effect.

In 2014, Boehringer agreed to pay $650 million to settle roughly 4,000 claims alleging that the company did not warn the public about the risks of uncontrolled bleeding with Pradaxa.