Which term best describes the range of doses in which a drug is expected to achieve therapeutic effect without unacceptable toxicity?

• A. Adverse Reactions
• B. Dosage Ranges
• C. Potency
• D. Therapeutic Level

Answer: (B)

The idea being tested is identifying the range of doses where a drug delivers its therapeutic effect without causing unacceptable toxicity. In pharmacology this is described as the therapeutic window or therapeutic range—the span between the minimum effective dose and the threshold at which toxicity or serious adverse effects begin. The option that best captures this concept is the term describing the dosing interval within which efficacy is achieved safely, i.e., dosage ranges. Staying within this range helps ensure the drug works as intended while minimizing harm; dosing below it may be ineffective, and dosing above it increases the risk of toxicity. Adverse Reactions are the harmful effects that can occur, not the safe dosing interval. Potency refers to how much drug is needed to produce an effect, not the protective range of doses. Therapeutic Level usually implies a concentration or level rather than the practical dose range.