Final answer:
The nurse should withhold the medication and notify the provider when a client refuses to receive it.
Step-by-step explanation:
The correct action for the nurse to take when a client refuses to receive a scheduled dose of lorazepam IM is to withhold the medication and notify the provider. It is important to respect the client's autonomy and right to refuse treatment. By documenting the client's refusal in the medical record, the nurse ensures that the refusal is properly documented for legal and continuity of care purposes.