奏效 literally combines 奏 (zòu), meaning 'to present' or 'to perform', and 效 (xiào), meaning 'effect' or 'result'. Together, they form a verb meaning 'to take effect' or 'to work' — especially in contexts where an action, treatment, method, or intervention begins to produce the intended result. It emphasizes the successful realization of purpose after some time or effort.

This word is commonly used in formal, written, or semi-formal spoken Chinese — especially when discussing medicine, policies, strategies, or problem-solving methods. It often appears in sentences describing delayed but positive outcomes: for example, a medicine may not work immediately, but eventually 奏效. Unlike colloquial alternatives like 有用 (yǒu yòng) or 管用 (guǎn yòng), 奏效 carries a slightly more objective, measured, and often positive connotation — implying that something has demonstrably achieved its goal.