tachyphylaxis

tachyphylactic /tak'euh fi lak"tik/, adj.
/tak'euh fi lak"sis/, n.
1. Med. immediate, temporary immunization against the effects of injection of a toxic extract owing to previous small injections of the same extract.
2. a decreased response to a medicine given over a period of time so that larger doses are required to produce the same response. Also, tachyphylaxia /tak'euh fi lak"see euh/.
[TACHY- + Gk phýlaxis a guarding, equiv. to phylak- (s. of phylássein to guard) + -sis -SIS]

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Universalium. 2010.

Look at other dictionaries:

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  • tachyphylaxis — noun A rapidly decreasing response to a drug following administration of the initial doses …   Wiktionary

  • tachyphylaxis — Rapid appearance of progressive decrease in response to a given dose following repetitive administration of a pharmacologically or physiologically active substance. [tachy + G. phylaxis, protection] * * * tachy·phy·lax·is .tak i fi lak səs n, pl… …   Medical dictionary

  • tachyphylaxis — n. reduced responsiveness (Medicine) …   English contemporary dictionary

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  • tachyphylaxis — tachy·phy·lax·is …   English syllables

  • tachyphylaxis — n. a falling off in the effects produced by a drug during continuous use or constantly repeated administration, common in drugs that act on the nervous system …   The new mediacal dictionary

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