The problem of quantitative evaluation of the pharmacological influence of physiologically active substances with receptor action on the organism under conditions of screening is discussed. A vector-significant criterion, based on a functional multiparameter method (FMM), is suggested as the basic characteristic of effectiveness of action. This criterion permits an evaluation of the latitude of the permissible physiological effect, the threshold of subtoxicity, and the selectivity of the action of the substance according to the dominant activity.
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