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Below the dosage levels used to treat diseases: subtherapeutic feeding of penicillin to livestock.

sub′ther·a·peu′ti·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


involving or relating to drug dosages administered at too low a level to produce a therapeutic effect(of a drug dosage) below the level necessary to treat disease, not powerful enough to have a therapeutic effect
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Antimicrobial agents are commonly used subtherapeutically as feed supplements to promote growth and to prevent infection in livestock.
According to the Federal Drug Administration, more than 80 percent of the 33 million pounds of antibiotics sold in the United States in 2009 was for agricultural use, and 90 percent of that was administered subtherapeutically through food and water.
Conventional cattle, pig, and poultry farms can use antibiotics both therapeutically and "subtherapeutically,." that is, to stimulate growth or prevent disease.