A nurse is caring for a client who requires a transfusion of one unit of packed RBCs.The nurse receives the following prescription: “Diphenhydramine 50 mg by mouth once, one hour prior to transfusion.”. The nurse should identify this as which of the following types of prescription?

Choice A rationalePRN prescriptions are given as needed, based on the client’s condition. Diphenhydramine before a transfusion is a scheduled, single-time dose, not an as-needed medication for specific symptoms.Choice B rationaleStanding prescriptions are ongoing orders for routine care. Diphenhydramine before transfusion is a one-time, pre-transfusion medication, not part of the client’s regular medication regimen.Choice C rationaleStat prescriptions are for immediate administration. Diphenhydramine given an hour before a transfusion is not for immediate use but is scheduled to prevent transfusion reactions.Choice D rationaleA single prescription is for a one-time dose. Diphenhydramine is prescribed once, one hour before transfusion, to premedicate and reduce the risk of allergic reactions.