The patient is to receive 120 mg of PO Lasix (furosemide). The drug book states that the usual dosage is 20 to 40 mg. What steps should the nurse take to avoid medication errors in this situation? (Select all that apply.)

Only administer 40 mg.

Use at least two patient identifiers whenever administering a medication.

Read labels at least two times to make sure it is the correct medication.

Double-check all calculations.

Question unusually large or small doses.