Answer: If a patient's blood pressure remains high despite taking nifedipine (Procardia XL) at a high dosage, the nurse should assess the patient's adherence to therapy and check for any other underlying conditions that may be contributing to the high blood pressure. If the patient is taking the medication as prescribed and there are no other underlying conditions, the nurse may recommend discussing a change in medication with the prescribing healthcare provider. This could include adding a different medication, such as a thiazide diuretic, to the patient's treatment plan. The nurse may also recommend lifestyle modifications, such as following the DASH diet and incorporating regular exercise, to help lower the patient's blood pressure.