What does the therapeutic window refer to in pharmacology?

• A. Range of doses that treat disease effectively while staying within safety range
• B. Time from dosing to peak effect
• C. Rate of drug metabolism
• D. Volume of distribution

Answer: (A)

The therapeutic window is the dose range in which a drug provides clinical benefit without causing unacceptable toxicity. It sits between the amount needed to achieve the desired effect and the amount that would lead to harmful effects, often described in terms of safe plasma concentrations. A drug with a wide therapeutic window gives more room for dosing without risking toxicity, while a narrow window requires careful monitoring and precise dosing. The other concepts mentioned—time to peak effect, rate of metabolism, and volume of distribution—describe how fast or where the drug acts in the body, not how safely it can be dosed.