Source:http://linkedlifedata.com/resource/umls/id/C0013220
MSH: Progressive diminution of the susceptibility of a human or animal to the effects of a drug, resulting from its continued administration. It should be differentiated from DRUG RESISTANCE wherein an organism, disease, or tissue fails to respond to the intended effectiveness of a chemical or drug. It should also be differentiated from MAXIMUM TOLERATED DOSE and NO-OBSERVED-ADVERSE-EFFECT LEVEL.,CSP: tendency of a drug, with repeated use, to become less effective (i.e., require higher dosage) or associated with user dependence; do not use for lack of adverse reactions, as in "the subject tolerated the drug well".,NCI: A reduction in the sensitivity to a drug following its repeated administration, in which increased doses are required to produce the same magnitude of effect previously produced by a smaller dose. This increase in dose may be necessitated by changes in the metabolism of the drug, or a cellular, physiological or behavioral adaptation to the effects of the drug.,NCI: A condition that occurs when