Forums Health Warfarin or Rivaroxaban? Reply To: Warfarin or Rivaroxaban? May 9, 2018 at 9:38 am #175 becky 9 Posts That’s always a risk, whatever anticoagulant you’re on: some people are just more “sticky” and clot in spite of being anticoagulated. It doesn’t mean that rivaroxaban’s crap: it can happen with rivaroxaban, warfarin, heparin injections… if it does happen, then we have to increase the intensity of your anticoagulation: in which case the options are warfarin with a higher INR target, or increasing the dose of heparin injections.