effective dose

the amount of a drug, or level of radiation exposure, that is sufficient to achieve the desired clinical improvement.
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American Heritage
Medical Dictionary

effective dose n.

Abbr. ED The dose, usually of a drug, that produces a desired effect.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
These drugs can be highly addictive, and should be prescribed at the lowest possible effective dose.
By my reading, all this vaccine would do is lower the effective dose taken in.
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