After a seven day treatment with an IV antibiotic, the healthcare provider discharges a client from the hospital and writes a prescription for an oral antibiotic. While providing discharge instructions, the nurse notes that the dosage for the oral antibiotic is significantly higher than the IV antibiotic. Which resource should the nurse use first in resolving the situation?

A. Healthcare provider: Consulting the prescriber is appropriate if a medication error or discrepancy is confirmed. However, before contacting the provider, the nurse should verify the correct dosage using a trusted reference to ensure there is an actual concern to report. B. Hospital pharmacist: The pharmacist is an excellent resource for clarifying drug dosages, conversions, and therapeutic ranges. Still, verifying the standard dosage independently first allows the nurse to approach the pharmacist with specific, evidence-based concerns if needed. C. Nursing unit charge nurse: The charge nurse can offer guidance on unusual orders but is not the primary source for determining the correct dosage. Their role would be more supportive after the nurse has verified the dosing discrepancy through reliable clinical resources. D. Medication reference guide: Using a reference guide first allows the nurse to independently verify whether the higher oral dose is standard practice, often due to differences in bioavailability between IV and oral routes.