プログレッシブ和英中辞典(第３版)の解説
やっこう【薬効】
the efficacy of a medicine [drug]
- 薬効のほどは定かでない
Whether the medicine will work or not is uncertain. - 徐々に薬効が現れた
The medicine took effect gradually. - 薬効かいなく死亡した
He died in spite of the medical care he was given.⇒やくせき(薬石)