what are some of the side effects of xarelto?
['Back pain.', 'bleeding gums.', 'bloody stools.', 'bowel or bladder dysfunction.', 'burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings.', 'coughing up blood.', 'difficulty with breathing or swallowing.', 'increased menstrual flow or vaginal bleeding.']