idiosyncratic

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id·i·o·syn·crat·ic

(id'ē-ō-sin-krat'ik),
Relating to or marked by an idiosyncrasy.

idiosyncratic

[-sinkrat′ik]
Etymology: Gk, idios, own, synkrasis, mixing together
pertaining to personal peculiarities or mannerisms.

id·i·o·syn·crat·ic

(id'ē-ō-sin-krat'ik)
Relating to or marked by an idiosyncrasy.

idiosyncrasy

(id?e-o-sin'kra-se) [? + syn, together, + krasis, mixture]
1. Special characteristics by which persons differ from each other.
2. That which makes one react differently from others; a peculiar or individual reaction to an idea, action, drug, food, or some other substance through unusual susceptibility. idiosyncratic (-sin-krat'ik), adjective

drug idiosyncrasy

An unusual response to a drug. It can manifest as an accelerated, toxic, or inappropriate response to the usual therapeutic dose of a drug.
Synonym: idiosyncrasy of effect

idiosyncrasy of effect

Drug idiosyncrasy.