Weighing Your Options Anticoagulants from National Stroke Association

In case you were wondering why aspirin wasn't mentioned.

What Are Anticoagulants and Antiplatelet Agents? - American Heart ...

 Weighing Your  Options Anticoagulants from National Stroke Association

Prepare for your next doctor visit by downloading our shared decision-making tool to help you determine the right questions to ask your doctor.

Nothing on aspirin or Guinness stout so this is not complete information. 

Guinness could really be good for you

A pint of the black stuff a day may work as well as a low dose aspirin to prevent heart clots that raise the risk of heart attacks.