Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
http://reference.medscape.com/drug-interactionchecker
But be sure to tell them ALL the drugs you may be taking. Just because Viagra may not interact with Xarelto doesn't mean that a combo of all your drugs might not have some interactions.
Include herbs/supplements too.