Rare side effects, which are likely to occur in fewer than 1 in 1,000 patients, are: • A sudden fall in blood pressure and, in isolated cases, anaphylactic shock, even if you have shown no hypersensitivity to previous administration. • Cases of temporary meningitis (reversible aseptic meningitis). • Cases of temporary reduction in the number of the red cells in the blood (reversible haemolytic anaemia/ haemolysis). • Cases of transient cutaneous reactions. • Increase in serum creatinine level and/ or acute renal failure.