tachyphylaxis

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tach·y·phy·lax·is

(tak'i-fī-lak'sis),
Rapid appearance of progressive decrease in response to a given dose after repetitive administration of a pharmacologically or physiologically active substance.
[tachy- + G. phylaxis, protection]

tachyphylaxis

/tachy·phy·lax·is/ (-fĭ-lak´sis)
1. rapid immunization against the effect of toxic doses of an extract or serum by previous injection of small doses of it.
2. rapidly decreasing response to a drug or physiologically active agent after administration of a few doses.tachyphylac´tic

tachyphylaxis

(tăk′ə-fĭ-lăk′sĭs)
n. pl. tachyphy·laxes (-fĭ-lăk′sēz)
1. Rapid desensitization to a toxic substance produced by inoculation with a series of small doses.
2. A rapidly decreasing response to a drug following administration of the initial doses.

tachyphylaxis

[tak′ēfəlak′sis]
Etymology: Gk, tachys + phylax, guard
1 (in pharmacology) a phenomenon in which the repeated administration of some drugs results in a rapidly appearing and marked decrease in effectiveness.
2 also called mithridatism, (in immunology), a rapidly developing immunity to a toxin because of previous exposure, such as from previous injection of small amounts of the toxin (named for Mithridates VI who used the technique to survive an assassination attempt).

tachyphylaxis

A decrease in response to a drug due to prior exposure to the agent, which may be countered by increasing the dose. Tachyphylaxis has been reported in some women taking subcutaneous hormone-replacement therapy, in whom menopausal symptoms recur in the face of normal serum oestrogen levels.

tach·y·phy·lax·is

(tak'i-fi-lak'sis)
Rapid appearance of progressive decrease in response to a given dose after repetitive administration of a pharmacologically or physiologically active substance.
[tachy- + G. phylaxis, protection]

tachyphylaxis (ta·kē·flakˑ·sis),

n swiftly developed tolerance to a drug or toxin achieved through repeated exposure to minute doses.

tach·y·phy·lax·is

(tak'i-fī-lak'sis)
Rapid appearance of progressive decrease in response to a given dose after repetitive administration of a pharmacologically or physiologically active substance.
[tachy- + G. phylaxis, protection]

tachyphylaxis (tak´əfəlak´sis),

n 1. the rapid development of tolerance on administration of closely spaced successive doses of a drug or poison.
2. a decreasing response that follows consecutive injections at short intervals.

tachyphylaxis

1. rapid immunization against the effect of toxic doses of an extract by previous injection of small doses of it.
2. rapidly decreasing response to a drug or physiologically active agent after administration of a few doses.