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What key concept does the therapeutic index help a nursing student understand?

  1. The range in which a drug is effective without being harmful

  2. The exact dosage required for each patient

  3. The time intervals for drug administration

  4. The symptom relief pattern for a given drug

The correct answer is: The range in which a drug is effective without being harmful

The therapeutic index helps a nursing student understand the range of doses in which a drug can be effective without causing harm to a patient. This concept is important because it allows nurses to properly monitor and adjust medication dosages to ensure the best possible outcome for their patients. The other options are incorrect because they do not specifically pertain to the safety and effectiveness of a drug. B refers to exact dosage, C refers to time intervals, and D refers to symptom relief, but none of these options consider the potential for harm from a drug. Therefore, A is the correct answer as it accurately describes the key concept of the therapeutic index.