Final answer:
The nurse manager's first action would be to investigate the client's claim of not receiving medications during client rounds.
Step-by-step explanation:
As a nurse manager, the first action when a client reports not receiving medications during client rounds would be to investigate the situation further and gather more information. The nurse should listen attentively to the client's concerns and ask follow-up questions to gain a clear understanding of the issue. This could include asking about specific medications, the timing of missed doses, and any potential reasons for the delay, such as medication administration errors or supply issues. By gathering more information, the nurse manager can then take appropriate action to address the client's concern.