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tachyphylaxis
Tachyphylaxis (Greek ταχύς, ''tachys'', "rapid", and φύλαξις, ''phylaxis'', "protection") is a medical term describing an acute rapid decrease in response to a drug after its administration.〔Bunnel, Craig A. Intensive Review of Internal Medicine, Harvard Medical School 2009.〕 It can occur after an initial dose or after a series of small doses. Increasing the dose of the drug may be able to restore the original response.
==Characteristics==
Tachyphylaxis is characterized by the rate sensitivity: the response of the system depends on the rate with which a stimulus is presented. To be specific, a high-intensity prolonged stimulus or often-repeated stimulus may bring about a diminished response also known as desensitization.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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