secret medicine; secret remedy; nostrum
A medicine or remedy whose formula is kept secret; often used in historical or fantasy contexts.
wonder drug; excellent remedy
A highly effective medicine, often with a miraculous or legendary quality; compare 妙薬.
See also: 妙薬
The alchemist succeeded in concocting a secret remedy.
This new drug is expected to be a wonder drug for cancer.
Compound of 秘 (secret) and 薬 (medicine).