A nurse is caring for a client who has a prescription for acyclovir IV three times daily. Which of the following actions should the nurse take?

Choice A rationale Acyclovir is primarily excreted renally, and its metabolism can lead to crystal formation in the renal tubules, particularly if the client is dehydrated or the infusion is too rapid. Monitoring for an increase in creatinine (normal range 0.6-1.2 mg/dL) is crucial as it indicates decreased glomerular filtration rate and potential nephrotoxicity or acute kidney injury, necessitating dose adjustment or hydration. Choice B rationale Administering oxygen prophylactically is not a standard or scientifically indicated action for acyclovir administration. Acyclovir does not inherently cause respiratory depression or compromise oxygenation. Its primary adverse effects are typically related to renal function, central nervous system, or gastrointestinal system, not respiratory compromise. Choice C rationale While some antiviral medications can affect hematopoiesis, acyclovir is not commonly associated with significant decreases in hemoglobin (normal range 12-18 g/dL) and hematocrit (normal range 37-52%). These parameters are generally monitored in clients with pre-existing hematological conditions or those on long-term, high-dose therapy, but it's not a primary immediate concern for IV administration. Choice D rationale Administering acyclovir IV over 30 minutes is the recommended infusion duration. Rapid intravenous infusion can increase the risk of renal tubular damage and crystal formation, leading to nephrotoxicity. A slower infusion rate allows for proper dilution and minimizes the concentration of the drug in the renal tubules, thus protecting kidney function and reducing adverse effects.