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therapeutic index
ther·a·peu·tic in·dex (plural ther·a·peu·tic in·dex·es)


noun 
Definition:
 
ratio of efficiency of drug: the ratio of the dose of a drug that causes cell damage to the dose typically needed to effect a cure. Use: indicates relative drug safety.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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