The formula for Therapeutic Index (TI) is _________. A higher TI indicates a _______ drug.

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Prepare for the Adverse Effects and Toxicology Test with our comprehensive format. Utilize flashcards and multiple-choice questions, complete with hints and explanations to ace your exam!

Multiple Choice

The formula for Therapeutic Index (TI) is _________. A higher TI indicates a _______ drug.

Explanation:
The key idea is the safety margin between the dose that produces a desired therapeutic effect and the dose that causes death or toxicity. The therapeutic index compares the lethal dose for 50% of subjects (LD50) with the dose that produces the desired effect in 50% of subjects (ED50). A larger ratio means you can reach the therapeutic effect well below the toxic or lethal level, so the drug is safer. That’s why LD50/ED50 is the standard formula and the interpretation that a higher TI indicates a safer drug. Using other formulations (like ED50/LD50) would invert the relationship and misrepresent safety, and terms like TD50 or ED90 don’t reflect the conventional safety margin between efficacy and lethality.

The key idea is the safety margin between the dose that produces a desired therapeutic effect and the dose that causes death or toxicity. The therapeutic index compares the lethal dose for 50% of subjects (LD50) with the dose that produces the desired effect in 50% of subjects (ED50). A larger ratio means you can reach the therapeutic effect well below the toxic or lethal level, so the drug is safer. That’s why LD50/ED50 is the standard formula and the interpretation that a higher TI indicates a safer drug. Using other formulations (like ED50/LD50) would invert the relationship and misrepresent safety, and terms like TD50 or ED90 don’t reflect the conventional safety margin between efficacy and lethality.

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