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medical efficacy; effect of a medicine
漢方薬の薬効について薬剤師が説明した。
A pharmacist explained the efficacy of the herbal medicine.
新薬の薬効は、厳格な臨床試験で認められた。
The efficacy of the new drug was confirmed in rigorous clinical trials.
この薬は薬効が高い。
This medicine has high efficacy.