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1. (Science: immunology) The rapid immunisation against the effect of toxic doses of an extract or serum by previous injection of small doses.

2. (Science: pharmacology) The rapidly decreasing response to a drug or physiologically active agent after administration of a few doses.

Origin: Gr. Phylaxis = protection

Retrieved from "http://www.biology-online.org/bodict/index.php?title=Tachyphylaxis&oldid=31984"
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