Rashes & hypersensitivity reactions (eg, bronchospasm, angioedema & anaphylaxis) & cross-sensitivity to related drugs; blood disorders (eg, agranulocytosis, leucopenia, hemolytic anaemia & thrombocytopenia). Convulsions, sweating, myalgia, paraesthesias, extrapyramidal effects, tremor, sleep disturbances, depression, confusion, tinnitus, hypotension, hair loss.