Which action should the nurse implement to assess the effectiveness of amlodipine?

A. Monitor the client's serum electrolytes: Amlodipine, a calcium channel blocker, primarily affects blood pressure and not directly electrolyte levels. Monitoring electrolytes is more relevant for medications that affect electrolyte balance, such as diuretics or certain antihypertensives. B. Measure the client's blood pressure: Amlodipine is used to treat hypertension and angina by relaxing blood vessels. The primary measure of its effectiveness is the reduction in blood pressure. Therefore, measuring the client’s blood pressure is crucial to assess whether the medication is effectively managing hypertension. C. Review the client's intake and output: While monitoring intake and output is important for assessing fluid balance and kidney function, it is not the primary method for evaluating the effectiveness of amlodipine in controlling blood pressure. D. Note the client's serum calcium levels: Amlodipine affects calcium channels but does not directly influence serum calcium levels significantly. Serum calcium levels are not used to assess the effectiveness of amlodipine in treating hypertension or angina.