noun
secret medicine; secret remedy; nostrum
A medicine or remedy whose formula is kept secret; often used in historical or fantasy contexts.
その錬金術師は秘薬の調合に成功した。
The alchemist succeeded in concocting a secret remedy.
noun
wonder drug; excellent remedy
A highly effective medicine, often with a miraculous or legendary quality; compare 妙薬.
See also: 妙薬
この新薬はガンに効く秘薬として期待されている。
This new drug is expected to be a wonder drug for cancer.