Drowsiness, dizziness, headache, lethargy, leg cramps, GI disturbances (e.g. diarrhoea, cramps), ataxia, mental confusion, rashes, pruritus, alopecia, hyponatraemia, electrolyte disturbances, gynaecomastia, hirsutism, menstrual irregularities, breast pain, deepening of the voice, impotence, leucopenia (including agranulocytosis), thrombocytopenia, transient elevation in BUN concentration. Rarely, breast enlargement.
Potentially Fatal: Hyperkalaemia.