Dyspepsia, upper GIT discomfort, diarrhea, constipation, abdominal pain; headache, drowsiness, nervousness, visual disturbances; skin rashes, urticaria. Allergic glomerulonephritis & reversible non-oliguric renal failure. Hemolytic anemia, agranulocytosis, pancytopenia, thrombocytopenia or thrombocytopenic purpura & bone marrow aplasia. False +ve result in tests for the presence of bile in urine.