A nurse in an outpatient surgical center is admitting a client for a laparoscopic procedure. The client has a prescription for preoperative diazepam (Valium). Prior to administering the medication, which of the following actions is the highest priority?

The highest priority action before administering any medication is to identify the client's medication allergies to prevent potential adverse reactions. Administering diazepam without knowing the client's allergies could lead to serious complications. Teaching the client about the medication's purpose is important but not as critical as ensuring the client does not have allergies. Administering the medication at the prescribed time is important but comes after ensuring safety. Documenting anxiety level is relevant but not as urgent as identifying allergies.