こうかてきめん

効果覿面
bring an immediate result on
have an instant effect on

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こうかてきめん【効果覿面】

●効果てきめんである be immediately effective; (begin to) work immediately [right away]; take immediate effect; have an immediate effect [result]; 《口》 work wonders; work like a charm; 〔薬などが〕 bring instant relief; cure 《a headache》in no time

・減給をほのめかしたら, 効果てきめん, 二度と遅刻しなくなったよ. I hinted at a drop in salary and he was never late again. | Mention of a salary cut cured his lateness for ever.