Another pathway could be the drug itself: Although the water used for making up the final doses was allegedly sterile, the steroid drug ingredient was not. (scientificamerican.com)
Such organisms are already churning out insulin and other drug ingredients, helping produce biofuels, teaching scientists about human disease and improving fishing and agriculture. (sciencedaily.com)
Acetaminophen is the most common drug ingredient in the U.S.. It's found in more than 600 medicines, and nearly a quarter of American adults use it weekly. (fortune.com)