A 72-year-old man, presenting with hypernephroma and infraclinic adren
al adenoma, developed severe hypokalaemia in the course of treatment f
or colonic perforation. Amikacin-induced hyperkaliuric hypokalaemia wa
s suspected, and confirmed by withdrawal of the drug as well as observ
ation of an unnoticed similar episode in the medical record of the pat
ient.