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This is called tolerance. Tolerance is built up by using a drug repeatedly over a period of time. This is true for pharmacutical drugs, as well as illegal substances, and alchohol. As a person's tolerance grows, they may need more amounts of the drug, and may need it more frequently.

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2009-11-24 21:21:29
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Q: What is it called when the body becomes used to the effect of a drug?
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