Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Also seek emergency medical attention if you have symptoms of a spinal blood clot: back pain, numbness or muscle weakness in your lower body, or loss of bladder or bowel control.
Rivaroxaban can cause you to bleed more easily. Call your doctor at once if you have signs of bleeding such as:
easy bruising or bleeding (nosebleeds, bleeding gums, heavy menstrual bleeding);
pain, swelling, new drainage, or excessive bleeding from a wound or where a needle was injected in your skin;
any bleeding that will not stop;
headaches, dizziness, weakness, feeling like you might pass out;
urine that looks red, pink, or brown; or
bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds.
Bleeding is the most common side effect of rivaroxaban.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Rivaroxaban side effects (more detail)
