Xarelto (Rivaroxaban) serious side effects: easy bruising, unusual bleeding (nose, mouth or rectum), bleeding from wounds or needle injections, any bleeding that will not stop; heavy menstrual periods; headache, dizziness, weakness, feeling like you might pass out; red or pink urine; black or bloody stools, coughing up blood or vomit that looks like coffee grounds; numbness, tingling, or muscle weakness (especially in your legs and feet); loss of movement in any part of your body.