In a clinical study conducted in type 2 diabetic patients with nephropathy, the incidence of hyperkalemia was higher in the group treated with Cozaar as compared to the placebo group (see section 4.8, 'Hypertension and type 2 diabetes with renal disease - Investigations’ and ‘ Post-marketing experience - Investigations’ Therefore, the plasma concentrations of potassium as well as creatinine clearance values should be closely monitored, especially patients with heart failure and a Creatinine Clearance between 30-50 ml/ min should be closely monitored.