not known: • reduced number of red blood cells (anaemia), • reduced number of thrombocytes, • migraine, • cough, • liver function abnormalities, • muscle and joint pain, • changes in kidney function (may be reversible upon discontinuation of treatment) including kidney failure, • flu-like symptoms, • increase in blood urea, • serum creatinine and serum potassium in patients with heart failure, • back pain and urinary track infection.