Lay people certainly might bookmark a medication they buy often, and if "the smart website silently replaces the correct drug with something similar but wrong" they might end up accidentally ordering and even consuming it.
This is the key to why “nothing is better than a best guess” is the right approach.
Answers that appear to be right can be worse than no answer at all.
Until the link changes and google redirects them or their email link incorrectly. Without 404s you get hit with a google duplicate penalty as many urls resolve to the same page.