This study is about two experimental drugs, REGN7508 and REGN9933. These drugs are being tested on people with a condition called atrial fibrillation, where the heart beats too quickly and unevenly. The goal is to see if these drugs can help stop blood clots from forming better than an existing medicine called apixaban.

The study will also check for any side effects, how well the drugs prevent strokes, and how the body reacts to them. Participants should have atrial fibrillation needing lifelong treatment. Some medical conditions might exclude people from joining the study, like having a mechanical heart valve or certain severe heart issues.

• The study compares two new drugs to a known one for safety and effectiveness.
• Participants need to meet specific health criteria and cannot have certain conditions.
• No compensation details are provided; check with the study team for more information.