A nurse is administering 4 mg of hydromorphone to a client by mouth every 4 hr. The medication is provided as hydromorphone 8 mg per tablet. Which of the following actions is appropriate for the nurse to take?

The correct answer is D: Dispose of the remaining medication while another nurse observes. This is the appropriate action because hydromorphone is a controlled substance with high abuse potential. The nurse should follow proper medication disposal protocols to prevent diversion or misuse. Returning the medication to the pharmacy (choice A) may not ensure proper disposal. Storing the remaining half of the pill in the automated medication dispensing system (choice B) or placing it in the unit dose package (choice C) could lead to unauthorized access. Disposing of the medication while another nurse observes (choice D) ensures accountability and adherence to safety measures.