Its lyrics tell of a fictional "wonder drug" that, when taken in a daily dose, can cure myriad ailments, much in the same way unscrupulous patent medicine salesmen marketed their wares in the 19th and early 20th centuries.
The song's lyrics tell of a fictitious "miracle cure" that, if consumed daily, can alleviate a wide range of health issues, similar to how unethical pharmaceutical salesmen marketed their remedies during the 19th and early 20th centuries.