The nurse administers an oral antiviral to a client with shingles. Which finding is most important for the nurse to report to the healthcare provide?

Rationale: A. Elevated liver function tests: Oral antivirals such as acyclovir or valacyclovir are metabolized by the liver, and elevated liver enzymes may indicate hepatotoxicity. This finding is critical and may necessitate discontinuation or dose adjustment to prevent liver damage. B. Vomiting and diarrhea: These are common side effects of oral antivirals and are usually self-limiting. They typically do not require discontinuation unless they lead to dehydration or are severe and persistent. C. Decreased white blood cell count: A decreased white blood cell can be a side effect of some antiviral medications, and while it increases the risk of infection, it is usually monitored during long-term therapy. However, in the context of acute shingles treatment with an oral antiviral, elevated liver function tests often represent a more immediate concern. D. Pruritus and muscle aches: These symptoms may occur with antiviral use but are usually mild and nonspecific. They should be monitored but are not as immediately concerning as signs of liver dysfunction.