MRCP-0601

MRCP-0601

A 75-year-old lady is referred to hospital from her GP. She has been treated for essential hypertension, with Bendroflumethiazide 2.5 mg once daily and triamterene 150 mg once daily.   Routine investigations show: Serum sodium 134 mmol/L (137-144) Serum potassium 5.9 mmol/L (3.5-4.9) Serum urea 7.0 mmol/L (2.5-7.5) Serum creatinine 100 μmol/L (60-110)   Her blood pressure is measured at 134/86 mmHg. Her electrocardiogram is normal. The GP has stopped the triamterene today.   Which of these is the most appropriate action?