The nurse plans to administer the adult clients’ prescriptions which are; metoprolol, hydrochlorothiazide, enoxaparin and atorvastatin. The current laboratory values are: Serum potassium 5.2 mmol/L, Platelet Count 98,000 /mm3, Serum cholesterol 250 mg/dL and Serum Creatinine 1.2 mg/dL. Which medication should the nurse hold and notify the prescriber?