‘见效’ literally means ‘to see effect’ — combining 见 (to see, to witness) and 效 (effect, result, efficacy). It describes the moment when a treatment, remedy, method, or effort begins producing observable, positive results. Unlike general terms for ‘working,’ 见效 emphasizes the visible or measurable onset of effectiveness, often after a waiting period.

This word is most commonly used in health-related contexts — such as describing how quickly medicine, therapy, or lifestyle changes start helping — but also appears in education, business, or personal development when outcomes become apparent. It’s typically used in the predicate position, often with time phrases (e.g., 三天后就见效) or modality verbs (e.g., 没有见效, 已经见效). It is not used as a standalone noun; rather, it functions as an intransitive verb expressing a change-of-state event.