Though BCG is well tolerated, few patients may have low-grade fever (<38.5ºC), burning sensation while you pass urine, frequent desire to pass urine, blood in the urine for a day or two. These can be managed by medications which your doctor will prescribe. But if the above symptoms are severe and persist more than 2 days, you will need to give urine for culture to rule out bacterial infection. However antibiotics like ofloxacin is to be avoided. You may be started on combination oral drug treatment for tuberculosis till the symptoms subside. Subsequent BCG dose may be reduced by your doctor. Some patients may develop high fever (>39.5ºC) or joint pains or skin rash or low blood pressure
. You will require admission and emergency management and the antitubercular drugs may need to be taken for 3-6months. Very rarely bladder capacity may shrink after the procedure.