When leaving a client's room, the practical nurse (PN) realizes that the wrong medications were given to the client. What action should the PN take?

A. Observe the client closely for one hour: The immediate priority after a wrong medication is to monitor the client for adverse reactions or side effects. Close observation allows the PN to detect early signs of toxicity or complications and respond promptly. B. Give an antidote to the medication: Administering an antidote is only appropriate if the medication has a known reversal agent and the client demonstrates symptoms. Giving one preemptively without signs can be unsafe. C. Ask if the client can spit out the medication: Once a medication has been swallowed, it cannot reliably be removed, making this intervention ineffective and unsafe. D. Report the error to the pharmacy: Reporting is necessary as part of follow-up and documentation, but the first action is to ensure client safety through observation and assessment before initiating reporting procedures.