A nurse inadvertently administers 160 mg of valsartan PO to a client who was scheduled to receive 80 mg. Which of the following actions is the priority for the nurse to take?

A. Nasal congestion is a possible side effect of ARBs, but it is not life-threatening. B. Checking laboratory results is not the immediate priority. C. Monitoring urine output is important in kidney function, but the immediate concern is hypotension. D. Valsartan is an angiotensin II receptor blocker (ARB) used for hypertension. A double dose increases the risk of hypotension, which can cause dizziness, syncope, and falls. The priority is to monitor for orthostatic hypotension.