Drug tolerance
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Drug tolerance occurs when a subject's reaction to a psychoactive drug (such as a painkiller or intoxicant) decreases so that larger doses are required to achieve the same effect. Drug tolerance can involve both psychological drug tolerance and physiological factors.
[edit] Conditioning
Tolerance may be related to familiarity of "drug onset cues". For example, the mind and body can become conditioned in response to environmental cues such as the sight of a needle or an alcoholic beverage, and therefore can produce the foundation of physiological responses before an actual drug is introduced to the body. [1] Thus, if there is no drug that follows said perception, or, if the dose is too small to produce the expected effect, such can trigger intense cravings in the addict. Exemplified, this theory may explain why "just one drink", or even just the sight or presence of familiar alcohol cues can cause a relapse in the case of a recovering alcoholic.
Tachyphylaxis is a medical term referring to the rapid development of drug tolerance.
