[Life threatening drug-induced hyperkaliemia--case report].

Patients with congestive heart failure are at increased risk of hyperkalemia due to coexisting morbidities and usage of multiple medications that impair potassium excretion--such as angiotensin-converting enzyme inhibitors or spironolactone. Because of the risk of this disturbance, knowledge of causation and prevention is mandatory. We described 3 patients with life threatening hyperkalemia (>8.5 mEq/t) caused by drugs. We showed the symptoms of increased potassium level, the list of medications and comorbidities predisposing to hyperkalemia. After a few days of medical treatment and dialysis, potasium level normalized in all of our patients.