Prior to administering medications, the student nurse reviews the therapeutic index. Which statement best describes the student's understanding of therapeutic index?
1. The student is able to determine if the physician prescribed the best drug for the patient.
2. The student is able to determine if the patients are receiving safe doses of the medications.
3. The student is able to identify interactions among the drugs each patient is receiving.
4. The student is able to identify the patients who will need to have serum blood levels monitored.
Correct Answer: 4
Rationale: Drugs with a narrow therapeutic index have a low safety margin and the concentration of the drug should be monitored by regular serum tests. The therapeutic index will give some information about safe doses, but this is not the most complete response. The therapeutic index will not help to determine if the physician prescribed the best drug for the patient. The therapeutic index will not help to identify interactions among the drugs the patients receive.
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