A 55-year-old man with hypertension controlled on ramipril 10mg OD presents for annual review. His BP is 135/85 mmHg. Routine blood tests show: Na+ 140 mmol/L, K+ 5.7 mmol/L, Urea 6.5 mmol/L, Creatinine 110 µmol/L (baseline 95 µmol/L). What is the most appropriate initial action regarding his ramipril?