Final answer:
The nurse should clarify the prescription with the healthcare provider and educate the client on the new medication for hypertension.
Step-by-step explanation:
The nurse's next action should be to clarify the prescription with the healthcare provider. This is important because adding a new medication, especially a calcium channel blocker, to a treatment regimen for hypertension requires careful consideration and coordination among healthcare providers. By clarifying the prescription, the nurse can ensure that the dosage, frequency, and rationale for the medication are correct.
In addition, the nurse should also educate the client on the new prescription. This includes explaining how the medication works, potential side effects to watch for, and any specific instructions to follow.
Assessing the client's blood pressure is also an important step, but it should be done after clarifying the prescription and educating the client.