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therapeutic index

noun, Pharmacology
1.
the ratio between the dosage of a drug that causes a lethal effect and the dosage that causes a therapeutic effect.
Also called margin of safety.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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therapeutic index in Medicine

therapeutic index n.
The ratio between the toxic dose and the therapeutic dose of a drug, used as a measure of the relative safety of the drug for a particular treatment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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