Potential induction of arrhythmias w/ catecholamines (eg, adrenaline & isoprenaline). Decrease in serum K levels & aggravate CV adverse reactions w/ xanthine derivatives (eg, theophylline, aminophylline & diprophylline). May excessively decrease serum K levels w/ corticosteroids (eg, betamethasone, prednisolone & hydrocortisone Na succinate) & diuretics (eg, furosemide).