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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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]
Medical Dictionary for the Dental Professions © Farlex 2012
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