Hi @falvictorvet and welcome to Mayo Clinic Connect. According to the FDA "Both Eliquis and Xarelto are known as factor Xa inhibitors, but they have some differences. Eliquis and Xarelto are both approved by the FDA for prescription use and are available in brand name only. No generic is available yet for either drug; however, a generic Eliquis should be available soon."

What's the difference - https://www.singlecare.com/blog/eliquis-vs-xarelto/

You will see that I moved your post to a discussion that discusses stopping Eliquis. I did this so that you can connect with other members on Connect that are currently taking the medication to see if anyone has ever received permission from their physician to use them interchangeably.

Did you ask you ER physician if you could take the Xarelto as a substitute if you cannot get in to see your cardiologist? Also, have you contacted the nurse at the cardiologist to see if they can advise?