Therapeutic Index · Pharmacology

The therapeutic window of a drug refers to:

  1. The time required to reach steady-state concentration
  2. The effective, non-toxic plasma drug concentration range
  3. The difference between LD50 and LD100
  4. The time interval between doses
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Correct answer: The effective, non-toxic plasma drug concentration range

The therapeutic window is the range of plasma drug concentrations that produces therapeutic effects without causing significant toxicity. It lies between the minimum effective concentration (MEC) and the minimum toxic concentration (MTC). Drugs with narrow windows require careful monitoring.

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