Forums Health Warfarin or Rivaroxaban? Reply To: Warfarin or Rivaroxaban? May 9, 2018 at 9:30 am #166 Sammyf 14 Posts Hi, Took it for around 6 months with no harmful side effects. The downside to it is that there isnt an “antidote” as it were so if you get a bleed you may well need treatment. On the plus side its out of your body in 24 hours.