藥
藥，係嚟自生物、人工合成或天然提取嘅物質，唔係平時食用需要嘅。藥一般喺生物體外合成，而「放入」體內先至產生「作用」；亦即係，藥食咗之後產生影响、改善身體機能，包括：減輕症狀、醫病、診斷、預防用、保健、固本培元、調理身體…
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有啲藥同生物體內嘅物質係一樣嘅，例如：激素，激素係生物自己喺體內合成，將激素打入體內，增加體內嘅量，令身體機能改變。
藥通常會用（食、吸入、打針）一個固定嘅時間，好返就唔使。亦有啲藥係要長期用嘅。
用藥傳統
用藥同埋兩大個傳統體系，同埋一個較新、另類嘅：
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